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.
import sys
input = sys.stdin.readline

s = list(input()[:-1].lower())
n = int(input())
for i in range(len(s)):
    if ord(s[i]) - 96 < n:
        s[i] = s[i].upper()

print(''.join(s))