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#include <bits/stdc++.h>
using namespace std;
void capital(char a[], int x) {
  if (a[x] >= 'a' && a[x] <= 'z') a[x] -= 32;
}
void small(char a[], int x) {
  if (x >= 'A' && a[x] <= 'Z') a[x] += 32;
}
int main() {
  char a[100];
  int x;
  gets(a);
  cin >> x;
  int l = strlen(a);
  int i;
  for (i = 0; i < l; i++) {
    if (a[i] < x + 97)
      capital(a, i);
    else
      small(a, i);
  }
  cout << a << endl;
  return 0;
}
