a = [int(s) for s in input().split()]
b = input()
c = list(b)
c[a[1] - 1] = c[a[1] - 1].lower()
print(''.join(c)) int(s) for s in input().split() for s in input().split() s input().split() ().split () input split for s in input().split() int(s) int s a = [int(s) for s in input().split()] a [int(s) for s in input().split()] b = input() b input() input c = list(b) c list(b) list b c[a[1] - 1] = c[a[1] - 1].lower() c[a[1] - 1] c a[1] - 1 a[1] a 1 1 c[a[1] - 1].lower() [a[1] - 1].lower [a[1] - 1] c a[1] - 1 a[1] a 1 1 lower print(''.join(c)) print ''.join(c) ''.join '' join c b = input() input() b c = list(b) list(b) c a = [int(s) for s in input().split()] [int(s) for s in input().split()] a
a = [int(s) for s in input().split()]
b = input()
c = list(b)
c[a[1] - 1] = c[a[1] - 1].lower()
print(''.join(c))