def F(S):
    T = []
    for i in range(len(S) - 1):
        if S[i] == S[i+1] == 1:
            T.append(0)
        else:
            T.append(1)
    return T


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

X = F(S)
Y = F(X)

if K == N - 1:
    print(*X, sep="")
    exit()

if K == N - 2:
    print(*Y, sep="")
    exit()

if (N - K) % 2 == 0:
    d = (N - K - 2) // 2
    print(*Y[d:-d], sep="")
else:
    d = (N - K - 1) // 2
    print(*X[d:-d], sep="")