#include <iostream>
#include <cctype>
 
int main() {std::string input;
 
std::cout << "Enter a six digits number: ";
std::cin >> input;
 
if(input.size() == 6) {
    for(char C : input) {
       if(std::isdigit(C)) {
           int digit = C - '0'; // convert char to a number
           // do whatever you want with the digit
          std::cout << digit << std::endl;
       }
       else {
           std::cout << "Error in input, " << C << " is not a digit" << std::endl;
           break;
       }
}
   }
else {
   std::cout << "Error: Enter exactly six digits please" << std::endl;
}
	return 0;
}

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MTIzNDU2

123456