Code

#include <cstdio>
#include <cmath>
int a[1000];
int cnt_a;
char c, c1;
int n;
int main(){
    while (scanf("%c", &c) != EOF) {
        n++;
        if (c == c1) {
            a[cnt_a]++;
        } else {
            a[cnt_a++]++;
            c1 = c;
        }
    }
    printf("%d", sqrt(n));
    for (int i = 0; i < cnt_a; ++i) {
        printf(" %d", a[i]);
    }
    return 0;
}