Problem:
Score : 100 points

Problem Statement

You are given a string S of length N consisting of A, B and C, and an integer K which is between 1 and N (inclusive).
Print the string S after lowercasing the K-th character in it.

Constraints

1 ≤ N ≤ 50

1 ≤ K ≤ N

S is a string of length N consisting of A, B and C.

Input

Input is given from Standard Input in the following format:

N K
S

Output

Print the string S after lowercasing the K-th character in it.

Sample Input 1

3 1
ABC

Sample Output 1

aBC

Sample Input 2

4 3
CABA

Sample Output 2

CAbA

Solution in Python (3.8.2) (judge verdict: Runtime Error)

print("STRING S")
a=int(input("enter the nth value:"))
b=int(input("enter the kth value:"))
if a==1:
  print("A")
elif a==2:
  print("B")
else:
  print("C")
if b==1:
  print("a")
elif b==2:
  print("b")
else:
  print("c")