#include<stdio.h>
int main()
{
    FILE *fin,*fout;
    fin=fopen("text.in","r");
    fout=fopen("text.out","w");
    char c='-';
    long long litere=0,cuv=0;
    while(c!='\n'&&c!=EOF)
    {
        c=fgetc(fin);
        int pp=0;
        while((c>='A'&&c<='Z')||(c>='a'&&c<='z'))
            c=fgetc(fin),pp=1,litere++;
        if(pp)
            cuv++;
    }
    fprintf(fout,"%lld",litere/cuv);
    return 0;
}