E.cpp

#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define fo(i,n) for(i=0;i<n;i++)
#define fo2(i,start,end) for(i=start;i<=end;i++)
#define rfo(i,n) for(i=n-1;i>=0;i--)
#define deb(x) cerr<<#x<<"="<<x<<endl
#define deb2(x,y) cerr<<#x<<"="<<x<<","<<#y<<"="<<y<<endl
#define ll long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define sortall(x) sort(all(x))
#define tr(it,a) for(auto it=a.begin(); it!=a.end();it++)
#define nl '\n'
#define PI 3.1415926535897932384626
#define mod 1000000007

typedef pair<int, int>	pii;
typedef pair<ll, ll>	pl;
typedef vector<int>		vi;
typedef vector<ll>		vl;
typedef vector<pii>		vpii;
typedef vector<pl>		vpl;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update > pbds; // find_by_order, order_of_key

const int N=1e6+10;
bool check(string a,string s,string t,int type){
    if(type==1){
        a.pb(a[0]);
    }
    for(int i=0;i<a.size()-1;i++){
        string s1 = a.substr(i,2);
        if(s1==s || s1==t){
            return false;
        }
    }
    return true;
}
void solve(){
    int i,j;
    int n;
    cin>>n;
    string s,t;
    cin>>s>>t;
    string a = "abc";
    cout<<"YES\n";
    do{
        if(check(a,s,t,1)){
            fo(i,n){
                cout<<a;
            }
            cout<<nl;
            return;
        }
    }while(next_permutation(all(a)));

    a="abc";
    do{
        if(check(a,s,t,2)){
            fo(i,a.size()){
                fo(j,n){
                    cout<<a[i];
                }
            }
            cout<<nl;
            return;
        }
    }while(next_permutation(all(a)));
}

int main(){
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
    
}