Language: C++

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

#define int long long
typedef pair<int, int> P;
#define mod 1000000007
#define INF (1LL<<60)
 
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)
#define YES puts("YES")
#define Yes puts("Yes")
#define NO  puts("NO")
#define No  puts("No")
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
 
const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };
 
 
#if 1
//-------------
// DUMPマクロ
// https://www.creativ.xyz/dump-cpp-652/
 
// vector
template <typename T>
istream& operator>>(istream& is, vector<T>& vec) {
    for (T& x : vec) is >> x;
    return is;
}
// pair
template <typename T, typename U>
ostream& operator<<(ostream& os, pair<T, U>& pair_var) {
    os << "(" << pair_var.first << ", " << pair_var.second << ")";
    return os;
}
// vector
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& vec) {
    os << "{";
    for (int i = 0; i < vec.size(); i++) {
        os << vec[i] << (i + 1 == vec.size() ? "" : ", ");
    }
    os << "}";
    return os;
}
// map
template <typename T, typename U>
ostream& operator<<(ostream& os, map<T, U>& map_var) {
    os << "{";
    repi(itr, map_var) {
        os << *itr;
        itr++;
        if (itr != map_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}
// set
template <typename T>
ostream& operator<<(ostream& os, set<T>& set_var) {
    os << "{";
    repi(itr, set_var) {
        os << *itr;
        itr++;
        if (itr != set_var.end()) os << ", ";
        itr--;
    }
    os << "}";
    return os;
}
 
#define DUMPOUT cerr
 
void dump_func() {
    DUMPOUT << endl;
}
template <class Head, class... Tail>
void dump_func(Head&& head, Tail&& ... tail) {
    DUMPOUT << head;
    if (sizeof...(Tail) > 0) {
        DUMPOUT << ", ";
    }
    dump_func(std::move(tail)...);
}
#ifdef _DEBUG
#define DEB
#define dump(...)                                                              \
    DUMPOUT << "  " << string(#__VA_ARGS__) << ": "                            \
            << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]"        \
            << endl                                                            \
            << "    ",                                                         \
        dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif
#endif



signed main() {

    int N;
    cin>>N;
    
    rep(i,N){
        char c; cin>>c;
        if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
    }
    cout<<"Three"<<endl;
    
    return 0;
}


Compiler output:
a.cc:111:54: error: stray '#' in program
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                      ^
a.cc:111:76: error: stray '#' in program
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                                            ^
a.cc:111:81: error: stray '#' in program
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                                                 ^
a.cc:111:101: error: stray '#' in program
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                                                                     ^
a.cc: In function 'int main()':
a.cc:111:53: error: expected primary-expression before '<' token
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                     ^
a.cc:111:55: error: '_InputIterator' was not declared in this scope
  111 |         if(c=='Y'){cout << "Four"<<endl; return 0;} <#_InputIterator __last#>, <#const _Tp &__value_#>)
      |                                                       ^~~~~~~~~~~~~~