#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
 
 
int main(int argc, char *argv[]) {
     
    int cuv=0, litere=0, this=0, prev=0;
    char c;
     
//  clock_t start = clock();
 
    FILE *f1 = fopen("text.in", "r");
 
    while(fscanf(f1, "%c", &c) > 0) {
        if( (c>='a' && c<='z') || (c>='A' && c<='Z') ) {
            this = 1;
            litere++;
        } else {
            this = 0;
        }
        //printf("c=%c,  this=%d  prev=%d  litere=%d   cuv = %d\n", c, this, prev, litere, cuv);
        if(this && !prev)
            cuv++;
        prev = this;
    }
     
    FILE *f2 = fopen("text.out", "w");
    fprintf(f2, "%d\n", litere/cuv);
 
    fclose(f1);
    fclose(f2);
    return 0;
}