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#include<iostream> //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȱ<EFBFBD><C8B1><EFBFBD>
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int main() {
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int i,j,n,m, a, b, cur,book[101]= {0},e[101][101];
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int que[10001],head,tail;
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scanf("%d %d",&n,&m);
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//<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>ά<EFBFBD><CEAC><EFBFBD><EFBFBD>
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for (i = 1; i <= m; ++i) {
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for (int j = 1; j <= n; ++j) {
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if (i == j)
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e[i][j] = 0;
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else
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e[i][j] = 99999999; //<2F><><EFBFBD><EFBFBD>99999999Ϊ<39><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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}
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}
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//<2F><><EFBFBD>붥<EFBFBD><EBB6A5>֮<EFBFBD><D6AE><EFBFBD>ı<EFBFBD>
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for (i = 1; i <= m; ++i) { //<2F><><EFBFBD>붥<EFBFBD><EBB6A5><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD>
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scanf("%d %d",&a,&b);
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e[a][b] = 1;
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e[b][a] = 1; //<2F><>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
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}
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//<2F><><EFBFBD>г<EFBFBD>ʼ<EFBFBD><CABC>
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head=1;
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tail=1;
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//<2F><>1<EFBFBD>Ŷ<EFBFBD><C5B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,<2C><>1<EFBFBD>Ŷ<EFBFBD><C5B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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que[tail]=1;
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tail++;
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book[1]=1;
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//<2F><><EFBFBD><EFBFBD><EFBFBD>в<EFBFBD>Ϊ<EFBFBD>յ<EFBFBD>ʱ<EFBFBD><CAB1>ѭ<EFBFBD><D1AD>
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while (head<tail && tail<=n) {
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cur=que[head];
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for (i = 1; i <= n; ++i) {
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if (e[cur][i] == 1 && book[i] == 0) {
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que[tail]=i;
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tail++;
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book[i] = 1;
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}
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if(tail>n) {
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break;
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}
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}
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head++;
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}
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for(i=1;i<tail;i++)
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printf("%d",que[i]);
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getchar();
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getchar();
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return 0;
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}
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