N,K=map(int,input().split())

S=list(input())

"""
s=[0]*N
for i in range(0,N-K+1):
    for k, c in enumerate(reversed(list(S[i:i+K]))):
        S[i+k] = c
        s[i+k] += 1

print(S)
print(s)
"""


shift = max(K-1,0)
# print(shift)
a="".join(S[shift:]) + "".join(list(reversed(S[:shift])))
print(a)