change numbers in word form to numeric form just like as phone number

#include <iostream>
#include <string>
#include <sstream>
#include <map>
using namespace std;

string convertSentenceToNumbers(const string &sentence) {
    map<string, int> wordToNumber;
    wordToNumber["one"] = 1;
    wordToNumber["two"] = 2;
    wordToNumber["three"] = 3;
    wordToNumber["four"] = 4;
    wordToNumber["five"] = 5;
    wordToNumber["six"] = 6;
    wordToNumber["seven"] = 7;
    wordToNumber["eight"] = 8;
    wordToNumber["nine"] = 9;
    wordToNumber["zero"] = 0;

    

    stringstream ss(sentence);
    string word;
    bool first = true;
    stringstream result;

    while (ss >> word) {
        if (wordToNumber.find(word) != wordToNumber.end()) {
            if (!first) {
                result << " ";
            }
            result << wordToNumber[word];
            first = false;
        } else {
            result << word;
        }
    }

    return result.str();
}

int main() {
    string sentence;
    cout << "Enter a sentence containing numbers in words: ";
    getline(cin, sentence);

    string converted = convertSentenceToNumbers(sentence);

    cout << "Converted sentence: " << converted << endl;

    return 0;
}