#include <iostream>
#include <stdlib.h>
#include <malloc.h>
#include <set>
#include <cstring>
using namespace std;

int main() {
    int *a;
    int *b;
    string input;
    cin >> input;
    bool aIsNotFull = true;

    int aSize = 0;
    int bSize = 0;

    int strLength = 0;
    for(char& c : input) {
        strLength++;
    }

    for(int i = 0; i < strLength; i++) {
        if(input[i] == ',') continue;


        if(aIsNotFull) {
            if(input[i] == '_') {
                aIsNotFull = false;
                continue;
            } else {
                int num = (int) (input[i] - '0');
                a = (int*) realloc(a, (aSize + 1) * sizeof(int));
                a[aSize++] = num;
            }
        } else {
            if(input[i] == '_') {
                break;
            } else {
                int num = (int) (input[i] - '0');
                b = (int*) realloc(b, (bSize + 1) * sizeof(int));
                b[bSize++] = num;
            }
        }
    }

    set<int> setA;
    for(int i = 0; i < aSize; i++) {
        setA.insert(a[i]);
    }


    set<int> setB;
    for(int i = 0; i < bSize; i++) {
        setB.insert(b[i]);
    }


    if(setA.size() == setB.size() ) {
        for (const int &number : setA) {
            if(setB.count(number) == 0) {
                cout << "no";
                return 0;
            }
        }
    } else {
        cout << "no";
        return 0;
    }

    cout << "yes";

    return 0;
}