#include <stdio.h>
#define MAX 50
int main () {
    int c, d;
    char cadeia[MAX + 1];
    scanf("%i", &c);
    getchar();
    scanf("%i", &d);
    getchar();
    fgets(cadeia, MAX + 1, stdin);
    d++;
    int indice = 0, salto = d, batata = 0;
    while(indice < c){
        if(cadeia[indice + salto] == 'X'){
            salto--;
        }else{
            indice += salto;
            salto = d;
            batata++;
        }
        if(salto == 0){
            batata = salto;
            break;
        }
        if(d > c){
            batata = 1;
            break;
        }
    }
    printf("Caso #1: %i\n", batata);
    return 0;
}