#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main()
{
    char tab[1001];
    int temp = 0;
    int max = 0;

    scanf("%1000[^n]", tab);

    for(int i = 0; i < strlen(tab); i++) {
        if(isalpha(tab[i])) {
            temp++;
        }
        else if(max < temp) { max = temp; temp = 0; }
        else temp = 0;
    }

    temp = 0;

    printf("%d\n", max);
/*
    for(int i = 0; i < strlen(tab); i++) {
        if(isalpha(tab[i])) {
            temp++;
            printf("%d\n", temp);
        }
        else if(max == temp) {
            for(int j = 0; j < max; j++) printf("%c", tab[i - max + i]);
            printf("\n");
            temp = 0;
        }
        else temp = 0;
    }
*/
    return 0;
}