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#include <fstream>
#include <algorithm>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int i,nr,nrchr;
char s[10000001];
int main()
{
while(fin>>s)
{
for(i=0;i<strlen(s);i++)
{
if((s[i]>=65 && s[i]<=90)||(s[i]>=97 && s[i]<=122))
{
nr++;
while((s[i]>=65 && s[i]<=90)||(s[i]>=97 && s[i]<=122))
{
nrchr++;
i++;
}
}
}
}
fout<<nrchr/nr;
return 0;
}