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 = input().lower()
num = int(input())
c = ""
for i in a:
    if ord(i) < num+97:
        c += i.upper()
    else:
        c += i.lower()
print(c)
