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#include <iostream>
#include <fstream>
using namespace std;
int i,j,nr,k;
char v[1000],n;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
while(f.get(n))
{
i++;
v[i]=n;
}
for(j=1; j<=i; j++)
if(v[j]<='z'&&v[j]>='a' || v[j]<='Z'&&v[j]>='A')
nr++;
j=0;
while(j<=i)
{
j++;
if(v[j]<='z'&&v[j]>='a' || v[j]<='Z'&&v[j]>='A')
{
k++;
while((((v[j]<='z')&&(v[j]>='a')) || (v[j]<='Z'&&v[j]>='A')))j++;
}
}
g<<nr/k;
return 0;
}