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#include<bits/stdc++.h>
using namespace std;
int main() {
int i,m,k;
int a[4];
for(i=1000; i<10000; i++) //9000次循环
{
m=i;
k=0;
//再来4次
while(m) {
a[k]=m%10;
m=m/10;
k++;
}
if(a[0]==a[3]&&a[1]==a[2]) {
printf("%d\n",i);
}
}
return 0;
}