#include <bits/stdc++.h>
using namespace std;
int n, num = 0;
string t, s = "";
char c, k;
int main()
{
cin >> n;
cin >> t;
for (int i = 0; i <n;) {
c = t[i];
num = 0;
if (c >= 'a' && c <= 'z') {
++i;
if (t[i] >= '0' && t[i] <= '9') {
while (t[i] >= '0' && t[i] <= '9') {
num *= 10;
num += t[i] - '0';
++i;
}
for (int j = 0; j < num; ++j)
cout << c;
} else {
cout << c;
c = t[i];
}
}
}
return 0;
}
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