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())
b = int(input())
for i in range(len(a)):
	if ord(a[i]) - ord('a') < b:
		a[i] = a[i].upper()
print(''.join(a))