#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using pl = pair<ll, ll>;

#define vl vector<ll>
#define vvl vector<vl>
#define vvvl vector<vvl>
#define vm vector<mint>
#define vvm vector<vm>
#define vvvm vector<vvm>
#define vp vector<pl>
#define vvp vector<vp>
#define vvvp vector<vvp>
#define vs vector<string>
#define vvs vector<vs>
#define vb vector<bool>
#define vvb vector<vb>
#define vvvb vector<vvb>
#define vd vector<double>
#define vvd vector<vd>
#define vvvd vector<vd>

#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for(ll i = ll(a); i < ll(b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)
#define all(x) std::begin(x), std::end(x)
#define make_unique(v) v.erase(unique(all(v)), v.end());
#define sum(...) accumulate(all(__VA_ARGS__), 0LL)
#define inf (0x1fffffffffffffffLL)

template<class... T>
void input(T&... a){
    (cin >> ... >> a);
}

template<class T, class L>
istream &operator>>(istream &is, pair<T, L> &p){
    is >> p.first >> p.second;
    return is;
}

template <class T>
istream &operator>>(istream &is, vector<T> &v) {
    for(auto &x : v) {
        is >> x;
    }
    return is;
}

template <class T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    for(int i = 0; i < (int)v.size(); i++) {
        if(i != (int)v.size() - 1)
            os << v[i] << " ";
        else
            os << v[i];
    }
    return os;
}

template <typename T, typename... Args>
auto vec(T x, int arg, Args... args) {
    if constexpr(sizeof...(args) == 0)
        return vector<T>(arg, x);
    else
        return vector(arg, vec<T>(x, args...));
}

template <class T>
auto min(const T &a) {
    return *min_element(all(a));
}

template <class T>
auto max(const T &a) {
    return *max_element(all(a));
}

template <class T>
bool chmin(T &a, const T &b) {
    return a > b ? a = b, true : false;
}

template <class T>
bool chmax(T &a, const T &b) {
    return a < b ? a = b, true : false;
}

struct IoSetup {
    IoSetup() {
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(10);
        cerr << fixed << setprecision(10);
    }
} iosetup;

int main(){
    string a, p, q;
    cin >> a >> p >> q;
    if(p == q){
        cout << "No" << endl;
    }else{
        cout << "Yes" << endl;
    }
}