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.
#!/usr/bin/env python3

s = input()
n = int(input())

x = ''.join(
c.upper() if ord(c) - ord('a') < n else c for c in s
)

print(x)