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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char S[100001];
int leng,cuv,lm;
char sep[]=",.!:;? ";
int main()
{
fin.getline(S,100001);
for(int i = 0 ; S[i]!=0 ;i++)
{
if(isalpha(S[i])!=0)
leng++;
}
char *p;
p=strtok(S,sep);
while(p)
{
cuv++;
p=strtok(NULL,sep);
}
lm=leng/cuv;
fout<<lm;
}