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()
k=int(input())
for i in a:
    if ord(i)<=ord('a')+k-1:
        print(a[i].upper(),end='')
    else:
        print(a[i],end='')