(C++ : Quize) Even Pair

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

bool is_even( string str, int i)
{
  for (int j = i; j < str.length(); j++)
  {
    if (!isdigit(str[j]))
      return false;
    int digit = str[j]-'0';
    if (digit % 2 == 0)
      return true;
  }
    return false;
}
string EvenPairs(string str) {
  // code goes here 
   for (int i = 0; i < str.length(); i++)
  {
    if (!isdigit(str[i]))
      continue;
    int digit = str[i] - '0';
    if (digit % 2 != 0)
      continue;
    if (is_even(str, i+1))
      return "true";
   }
    return "false";

}

int main(void) { 
   
  // keep this function call here
  cout << EvenPairs(coderbyteInternalStdinFunction(stdin));
  return 0;
    
}