string input;
while(input != "DONE"){
    if(input == "DONE"){
        break;
    }
    cout<<"Enter the opcode/operand to enter an instruction or 'DONE' to exit: ";
    cin>>input;


    // Seperate input
    bool opcode_bool = true;

    string opcode;
    string operand;
    for(int i = 0; i < input.length(); i++){
        if(input[i] == ' '){
            opcode_bool = false;
            continue;
        }

        if(opcode_bool == true){
            opcode = opcode + input[i];
        }else{
            operand = operand + input[i];
        }

    }

    cout<<opcode<<endl<<operand<<endl;
cout<<"END OF ITERATION"<<endl;
}