#include <iostream>
using namespace std;
int main() {
// your code goes here
int count=0;
int input[25][25]={0,};
bool flag[25][25]={false};
cin >> count;
for(int i=0;i<count;i++)
{
for(int j=0;j<count;j++)
{
cin>>input[i][j];
}
}
for(int i=0;i<count;i++)
{
for(int j=0;j<count;j++)
{
if(!flag[i][j])
cout << input[i][j];
}
cout << "" << endl;
}
return 0;
}
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