#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include <string.h>
#define MAX(a,b) (((a)>(b))?(a):(b))
#define MIN(a,b) (((a)<(b))?(a):(b))
int main(){
    char input[128] = { 0 }, cur;
    int i, lwr = 0, upr = 0, dig = 0, cat = 0, len;
    int replace, remove, cnt;

    scanf("%s", input);
    len = strlen(input);
    for(i = 0;input[i];i++){
        if(islower(input[i])){
            lwr = 1;
        }
        else if(isupper(input[i])){
            upr = 1;
        }
        else if(isdigit(input[i])){
            dig = 1;
        }
    }
    cat = lwr + upr + dig;
    if(len < 6){
        printf("%d\n", MAX(6 - len, 3 - cat));
    }
    else if(len <= 20){
        replace = 0;cnt = 0;
        cur = '#';
        for(i = 0;input[i];i++){
            if(input[i] == cur){
                cnt += 1;
            }
            else{
                replace += cnt / 3;
                cnt = 1;
                cur = input[i];
            }
        }
        replace += cnt / 3;
        printf("%d\n", MAX(replace, 3 - cat));
    }
    else{
        int rm2 = 0;
        cnt = 0;remove = len - 20;replace = 0;
        cur = '#';
        for(i = 0;input[i];i++){
            if(input[i] == cur){
                cnt += 1;
            }
            else{
                if(remove > 0 && cnt >= 3){
                    if(cnt % 3 == 0){
                        remove -= 1;replace -= 1;
                    }
                    else if(cnt % 3 == 1){
                        rm2 += 1;
                    }
                }
                replace += cnt / 3;
                cnt = 1;cur = input[i];
            }
        }
        if(remove > 0 && cnt >= 3){
            if(cnt % 3 == 0){
                remove -= 1;replace -= 1;
            }
            else if(cnt % 3 == 1){
                rm2 += 1;
            }
        }
        replace += cnt / 3;
        int use2 = MIN(replace, MIN(rm2, remove / 2));
        replace -= use2;remove -= use2 * 2;
        int use3 = MIN(replace, remove / 3);
        replace -= use3;
        remove -= use3 * 3;
        printf("%d\n", (len - 20) + MAX(replace, 3 - cat));
    }
}