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

s = "z"
S = input()
s += S
#print(s)

for i in range(N-K+1):
    #if i == 0:
    s = s[:i+1]+s[i+K:i:-1]+s[i+K+1:]
    #print(s)
    #else:
    #    print(S[:i],S[i+K-1:0:-1])
    #    S = S[:i]+ S[i+K-1:i:-1]+S[i+K:]
    #    print(S)
    
print(s[1:])