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 = input()
k = int(input())
result = ''.join(c.upper()
                 if ord(c) < k+97
                 else c.lower()
                 for c in s)
print(result)
