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include <bits/stdc++.h>

using namespace std; int main(){

for(int i = 2; i <= 10000; i++){
    int s = i * i;
    int j = i;
    while(s % 10 == j % 10){
        j = j / 10;
        s = s / 10;
    }
    if(j == 0) cout << i << endl;
}
return 0;

}