#include <iostream>
#include <string>
using namespace std;
int main() {
string z, zz;
int x, y;
cin >> x >> y >> z >> zz;
int a;
for (a = 0; a < x; ++a) {
cout << a;
for (int b = 1; b <= y; ++b) {
cout << zz;
}
}
cout << a;
return 0;
}
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