看了半天才明白题意😂，12345每位之和为1+2+3+4+5 = 15，用英文表达为one five。

#include <iostream>
#include <algorithm>

using namespace std;

char word[][10] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

int main()
{
    string s;                               //高精度数字用字符串储存
    cin >> s;

    int n = 0;
    for (auto c : s) n += c - '0';          //遍历字符串，累加每一位数

    s = to_string(n);                       //数字转换为字符串

    for (int i = 0; i < s.size(); i ++ )    
    {
        cout << word[s[i] - '0'] << ' ';
    }

    return 0;


}