#include <stdio.h>

int main()
{
	int N, K;
	char S[400001];
	scanf("%d %d", &N, &K);
	scanf("%s", S);
	
	int i;
	char T[2][400001];
	for (i = 0; i < N - 1; i++) {
		if (S[i] == '1' && S[i+1] == '1') T[0][i] = '0';
		else T[0][i] = '1';
	}
	for (i = 0; i < N - 2; i++) {
		if (T[0][i] == '1' && T[0][i+1] == '1') T[1][i] = '0';
		else T[1][i] = '1';
	}
	if (K % 2 == N % 2) {
		T[1][N-1-(N-K)/2] = 0;
		printf("%s\n", &(T[1][(N-K)/2-1]));
	} else {
		T[0][N-(N-K+1)/2] = 0;
		printf("%s\n", &(T[0][(N-K+1)/2-1]));
	}
	fflush(stdout);
	return 0;
}