#include <iostream>
#include <cstring>
using namespace std;
const int TEN = 10;
int strToNumber(char s[]) {
int num = 0;
int i = 0;
while (s[i] != '\0' && i <= 8) {
num = num * TEN + (s[i] - '0');
++i;
}
return num * num;
}
int main() {
char nr[101];
cin.getline(nr, 101);
cout << strToNumber(nr) << " ";
return 0;
}
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