Simple program crashes after using switch - C

I just have written a program which suppose to return char which appears the most/least. Program work during the testing without switch statement, but when I added it start to crash. Can you have a look?

Main function

#include <stdio.h>
#include <stdlib.h>
#include "tools.h"

int main(int argc, char *argv[]) {
    int count[256] = { 0 };
    int c;
    while ( (c=getchar())!=EOF ){
        count[c]++;
    }
    switch (argv[1][1]) {
    case 'm': case 'M':
        mostOften(count);
        break;
    case 'l': case 'L':
        leastOften(count);
        break;
    default:
        mostOften(count);
        break;
    }
    return 0;
}

Tools function

#include <stdio.h>
#include <stdlib.h>
#include "tools.h"

void mostOften(int *s) {
    int j;
    int max, cha;
    for(j=32; j<126; j++){
        if(s[j]>max) {
                max=s[j];
                cha=j;
        }
    }
    printf("char %c: %d times\n", cha, max);
}

void leastOften(int *s) {
    int j;
    int min=10000, cha;
    for(j=32; j<126; j++){
        if(s[j] && s[j]<=min) {
                min=s[j];
                cha=j;
        }
    }
    printf("char %c: %d times\n", cha, min);
}