int main() {

    int n,k;
    scanf("%d%d ",&n,&k);
    unsigned char s[n+k];
    scanf("%s",s);
    int arr[n];
    int res[n];

    for(int i = 0; i < n; i++)
    {
        arr[i] = (int)s[i]%48;
        
        if(i==0)
            res[0]=arr[0];
        else if(i<k)
            res[i]=arr[i]^arr[i-1];
        else
            res[i]=arr[i]^arr[i-1]^res[i-k];
        
        printf("%d",res[i]);
        
    }    
    return 0;
}