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#include <bits/stdc++.h>
const double eps = 1e-9;
const double pi = acos(-1);
const int oo = 1000000000;
const int mod = 1000000007;
const double E = 2.7182818284590452353602874713527;
using namespace std;
string a;
int main() {
  int b;
  cin >> a >> b;
  for (int i = 0; i < a.size(); i++)
    if (a[i] >= 'a' && a[i] <= 'z' && a[i] - 'a' < b) a[i] -= 'a' - 'A';
  cout << a << endl;
  return 0;
}
