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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[300];
int n,i,lg,cuv,j,cnt;
int cuvant(char n)
{
if(n>='a' && n<='z')
return 1;
if(n>='A' && n<='Z')
return 1;
return 0;
}
int main()
{
f.getline(s,300);
n=strlen(s);
for(i=0;i<n;i++)
{
if(cuvant(s[i])==1)
lg++;
j=i;
cnt=0;
if(cuvant(s[j])==1 && cuvant(s[j+1])==1)
{
while(cuvant(s[j])==1)
{
cnt++;
j++;
}
i=j;
if(cnt!=0)
cuv++;
}
}
if(lg==0)
g<<0;
else
g<<lg/cuv;
return 0;
}