#include <iostream>
using namespace std;
char arr[6][16] = { '\0' };
int main() {
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 15; j++) {
char n;
cin >> noskipws >> n;
if (n == '\n') break;
arr[i][j] = n;
}
}
for (int j = 0; j < 15; j++) {
for (int i = 0; i < 5; i++) {
if (arr[i][j] == '\0') continue;
cout << arr[i][j];
}
}
return 0;
}
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