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#include <iostream>
#include <string.h>
using namespace std;
int main ()
{
int nrlit=0, nrcuv=0,nr=0;
freopen("text.in", "r", stdin);
freopen("text.out", "w", stdout);
char s[100],sir[100];
fgets(s, 100, stdin);
int n=strlen(s);
int i=0;
while(i!=n)
{
if((s[i] >= 'A' && s[i] <= 'Z')|| (s[i] >= 'a' && s[i] <= 'z') )
{
nr++;
}
else
{
if(nr>0)
{
nrcuv++;
nrlit+=nr;
nr=0;
}
}
i++;
}
int x=nrlit/nrcuv;
printf("%d\n", x);
return 0;
}