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#include <fstream>
#include <cmath>
#include <vector>
#include <algorithm>
#include <map>
#include <string>
#include <bitset>
#define pb(a) push_back(a)
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
string a;
int lungime;
int cuvinte;
bool is_digit(char a){
return a >= 'A' && a <= 'Z' || a >= 'a' && a <= 'z';
}
int main(){
getline(cin, a);
for(int i = 0; i < a.size(); ++i){
if(is_digit(a[i])){
lungime++;
}
}
for(int i = 0; i < a.size(); ++i){
if(!is_digit(a[i]) && is_digit(a[i - 1])){
cuvinte++;
}
}
cout << lungime / cuvinte;
return 0;
}