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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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int N;
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cin>>N;
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int a[N] = {0};
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for(int i=0;i<N;i++)
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{
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cin>>a[i];
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}
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sort(a, a + N, less<int>() );
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int n = unique(a, a + N) - a;
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cout<<n<<endl;
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for (int i = 0; i < n; i++)
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{
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cout << a[i] << " ";
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}
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return 0;
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}
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