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If (1 + 1 == 2) copy this:

#include <cassert>

#include <cctype>

#include <cerrno>

#include <cfloat>

#include <ciso646>

#include <climits>

#include <clocale>

#include <cmath>

#include <csetjmp>

#include <csignal>

#include <cstdarg>

#include <cstddef>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <ctime>

#include <cwchar>

#include <cwctype>

#include <ccomplex>

#include <cfenv>

#include <cinttypes>

#include <cstdalign>

#include <cstdbool>

#include <cstdint>

#include <ctgmath>

#include <cuchar>

#include <algorithm>

#include <bitset>

#include <complex>

#include <deque>

#include <exception>

#include <fstream>

#include <functional>

#include <iomanip>

#include <ios>

#include <iosfwd>

#include <iostream>

#include <istream>

#include <iterator>

#include <limits>

#include <list>

#include <locale>

#include <map>

#include <memory>

#include <new>

#include <numeric>

#include <ostream>

#include <queue>

#include <set>

#include <sstream>

#include <stack>

#include <stdexcept>

#include <streambuf>

#include <string>

#include <typeinfo>

#include <utility>

#include <valarray>

#include <vector>

#include <array>

#include <atomic>

#include <chrono>

#include <codecvt>

#include <condition_variable>

#include <forward_list>

#include <future>

#include <initializer_list>

#include <mutex>

#include <random>

#include <ratio>

#include <regex>

#include <scoped_allocator>

#include <system_error>

#include <thread>

#include <tuple>

#include <typeindex>

#include <type_traits>

#include <unordered_map>

#include <unordered_set>

#include <shared_mutex>

#include <any>

#include <charconv>

#include <filesystem>

#include <optional>

#include <memory_resource>

#include <string_view>

#include <variant>

#include <barrier>

#include <bit>

#include <compare>

#include <concepts>

#include <latch>

#include <numbers>

#include <ranges>

#include <span>

#include <stop_token>

#include <semaphore>

#include <source_location>

#include <syncstream>

#include <version>

using namespace std;

int main(){

    int a;cin >> a;cout << a << " ";if (a <= 9 and a >= 100) cout << "不"; cout << "是兩位數" << endl; return 0;

}