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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
char s[100],b[200]="qwertyuioplkjhgfdsazxcvbnmQWERTYUIOPLKJHGFDSAZXCVBNM";
int ct=0,cu=0;
f.get(s,100);
for(int i=0;i<strlen(s);i++)
{
if(strchr(b,s[i]))
ct++;
if(!strchr(b,s[i+1]) && strchr(b,s[i]))
cu++;
}
g<<ct/cu;
f.close();
g.close();
return 0;
}