The first line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be a letter of English alphabet, lowercase or uppercase.

The second line of the input is an integer between 0 and 26, inclusive.
s, n = input(), int(input())

res = ''

for x in s.lower():
    if ord(x) < n + 97: res += x.upper()
    else: res += x

print(res)