#include <cstdio>

#include <cstring>

#include <cctype>

#define DS 1025*1025
int i, caractere, cuvinte, lim;
char cuv[DS];
bool cuvantluat;
int main()

{

freopen("text.in", "r", stdin);

freopen("text.out", "w", stdout);

while(fgets(cuv, DS, stdin)!=NULL)

{

lim=strlen(cuv);

for(i=0; i<lim; i++)

{

if(isalpha(cuv[i]))

{

caractere++;

cuvantluat=true;

}

else if(cuvantluat)

{

cuvinte++;

cuvantluat=false;

}

}

}
printf("%d", caractere/cuvinte);

}