N,K=map(int,input().split())
S = input()
for i in range(1,N-K+2):
    if i==1:
        S= S[i-1:i+K-1][::-1] + S[i+K-1:]
    else:
        S= S[:i-1]+S[i-1:i+K-1][::-1] + S[i+K-1:]
print(S)