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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,k,m,nr,n,ok;
char simb[110],s[11000000];
char sir[11000000],*p,cuv[11000000],vec[]="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
int main()
{
while(f.get(s,1100000)){
strcat(sir,s);
}
n=strlen(sir);
m=0;
nr=0;
for(i=0;i<n;i++){
if(strchr(vec,sir[i])==0){
if(ok==1){
nr++;
ok=0;
}
}
else{
m++;ok=1;
}
}
if(nr>0)g<<m/nr;
else g<<0;
}