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#include <fstream>
#include <cstring>
#include <stdio.h>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
int i,nc=1,aux=0,nt=0;
char a[100];
char c[100]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
cin.getline(a,100);
for(i=0; i < strlen(a); i++)
{
if( !strchr(c,a[i]) && strchr(c,a[i+1]) && strchr(c,a[i-1]))
{
nc=nc+1;
}
if(strchr(c,a[i]))
{
nt=nt+1;
}
}
cout<<nt/nc;
return 0;
}