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=list(input().lower())
n=int(input())
b=list('abcdefghijklmnopqrstuvwxyz'[:n])
for i in range(len(a)):
    if a[i] in b:
        a[i]=a[i].upper()
print(*a, sep='')        