How to Implement Template class function selection sort to handle integers and strings?

Hello im creating a template class function of selection sort i wanted to know how i can change the code so that it could work for both arrays of integers and strings,right now it only works for strings code is below when i input numbers with only integers but when i input strings i get an error.

#include <iostream>
#include "Sort_Class.cpp"
#include <string>
using namespace std;
int main() {
    int  numbers[] = {8, 7, 2, 1};
    const int  NUMBERS_SIZE = 4;
    int i = 0;
    cout << "UNSORTED: " << endl;
    for(i = 0; i < NUMBERS_SIZE; ++i) {
        cout << numbers[i] << " ";
    }
    cout << endl;
    Sort_Class::SelectionSort(numbers,NUMBERS_SIZE);
    cout << "SORTED: ";
    for(i = 0; i < NUMBERS_SIZE; ++i) {
        cout << numbers[i] << " ";
    }
    cout << endl;
    return 0;
}





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

class Sort_Class{

  public:
  template<typename TheType>
    static void SelectionSort(TheType numbers[],int numbersSize);
   //static void InsertionSort(TheType Numbers[], int numbersSize);
   //static void Merge(TheType numbers[],  int i,int j, int k);
   //static void MergeSort(TheType numbers[], int i,int k);
};
template<typename TheType>
 void Sort_Class::SelectionSort(TheType numbers[], int numbersSize) {
  int i = 0;
  int j=0;
  int indexSmallest = 0;
  int temp = 0;
    for (i = 0; i < numbersSize - 1; ++i) {
        // Find index of smallest remaining element
        indexSmallest = i;
        for (j = i + 1; j < numbersSize; ++j) {
            if ( numbers[j] < numbers[indexSmallest] ) {
                indexSmallest = j;
            }
        }
        // Swap numbers[i] and numbers[indexSmallest]
        temp = numbers[i];
        numbers[i] = numbers[indexSmallest];
        numbers[indexSmallest] = temp;

    }

    cout<< "Temp Selection Sort" << " " << endl << temp <<" " << endl << "Numbers[i]"<<" "<< endl << numbers[i]<<" "<< endl << "numbers[indexsmallest]"<< endl << numbers[indexSmallest]<<" "<< endl << "i"<<" "<<i<<" "<< endl << "J"<<" "<<j<<endl;
    return;

}