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

int main()
{
    FILE *input, *output;

    input = fopen ("text.in", "rt");
    output = fopen ("text.out", "wt");

    char text[999999];
    int i, k;
    int ChrCounter = 0;
    int WrdCounter = 0;

    fgets(text, 999999, input);

    for (i=0; i<strlen(text); i++)
    {
        if ( (text[i] >= 'a' && text[i] <= 'z') || (text[i] >= 'A' && text[i] <= 'Z') )
        {
            ChrCounter++;
            k=0;
        }
        if ( !(text[i] >= 'a' && text[i] <= 'z') && !(text[i] >= 'A' && text[i] <= 'Z') )
        {
            k++;
            if (k == 1)
                WrdCounter++;
        }
    }

    fprintf(output, "%d" , ChrCounter/WrdCounter);
}