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#include <bits/stdc++.h>
using namespace std;
char s[55], ch, ans[55];
int num, len, lenA = 0;
char dx(char x) {
  if (x >= 'a' && x <= 'z') x = x - 'a' + 'A';
  return x;
}
char xx(char x) {
  if (x >= 'A' && x <= 'Z') x = x - 'A' + 'a';
  return x;
}
int main() {
  int i, j;
  scanf("%s", s);
  len = strlen(s);
  scanf("%d", &num);
  for (int i = 0; i < len; i++) s[i] = xx(s[i]);
  for (i = 0, j = 0; j < num; j++, i++) {
    if (i == len) i = 0;
    ch = s[i];
    if (ch < (num + 97))
      ans[lenA] = ans[lenA++] + dx(ch);
    else
      ans[lenA] = ans[lenA++] + xx(ch);
  }
  ans[lenA] = 0;
  for (int i = 0; i < len; i++) printf("%c", ans[i]);
  return 0;
}
