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().lower()
n=int(input())
ss=""
for i in s:
    if ord(i)<n+97:
        ss+=i.upper()
    else:
        ss+=i.lower()
print(ss)