Forth

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;

 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

    int x;
    cin >> x;
    if (x == 1) {
        cout << 2 << "\n";
        cout << "DUP DROP\n";
        return 0;
    }
    vector<string> res;
    for (int i = 0; i < x-1; i++) res.push_back("DUP");
    for (int i = 0; i < x-1; i++) res.push_back("+");
    cout << res.size() << "\n";
    for (auto s : res) cout << s << " ";
    cout << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED