#include <stdio.h>

int main(){
    int in, last = -1;
    int count = 0, max_count = 0;
    while(scanf("%d", &in) != EOF){
        int lead = in, digits = 1;
        while(lead/10 != 0){
            lead /= 10;
            digits ++;
        }

#ifdef DEBUG
        printf("last %d lead %d digits %d\n", last, lead, digits);
#endif

        if(lead == last){
            count += digits;
        }
        else{
            if(count > max_count) max_count = count;
            count = digits;
        }
        last = in%10;

#ifdef DEBUG
        printf("count %d\n", count);
#endif

    }
    if(count > max_count) max_count = count;
    printf("%d\n", max_count);

    return 0;
}