import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        if(!hasNextInt()){
             System.out.println("Invalid input");
            return;
        }
        if (str == null || str.isEmpty()) {
            System.out.println("Invalid input");
            return;
        }
        str = str.toLowerCase();
        String inputChar = sc.nextLine();
        if (inputChar.length() != 1) {
            System.out.println("Invalid input");
            return;
        }
        char ch = Character.toLowerCase(inputChar.charAt(0));
        if (!Character.isLetter(ch)) {
            System.out.println("Invalid input");
            return;
        }
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            if (str.charAt(i) == ch) {
                count++;
            }
        }
        double percentage = ((double) count / str.length()) * 100;
        System.out.printf("%d%%\n",Math.round(percentage));
    }
}