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#include<fstream>
#include<string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s;
int i,nrcuv,nr,sw=0;
int litera(char c){
if ('a'<=c && c<='z') return 1;
if ('A'<=c && c<='Z') return 1;
return 0;
}
int main(){
i=0;
while(fin.get(s)){
if (litera(s)){
nr++;
if (sw==0){
nrcuv++;
sw=1;
}
}
else
sw=0;
}
fout<<nr/nrcuv;
fin.close();
fout.close();
return 0;
}