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.
a = 'abcdefghijklmnopqrstuvwxyz'
s = input()
n = int(input())
new = ''

for i in s:
    if i in a[:n-1]:
        new += i.upper()
    else:
        new += i
print(new)