#include<iostream> #include<string> #include<iomanip> using namespace std; int main() { string str; char ch; int num = 0; while (true) { cin >> ch >> str; int a = str.length(); for (int i = 0; i < a; i++) { if (ch == str[i] || toupper(ch) == str[i]) { num++; } } cout << fixed << setprecision(5); cout << (float)num / a << endl; } }