i think i got the answer but i just want to make sure before i turn in my homework

the formula is 123 + 456 = 612

2. Although the first manned spaceship to land on Mars found no signs of current life, they did find the ruins of an ancient stone wall with the tollowing formula engraved on its face 123-456-612 Assuming the individual characters all represent the same things as in our notation, how many total digits (fingers and thumbs) should the Martians have (on whatever they used for hands)? Explain how you arrived at your conclusion. HINT: You need to determine in what base the formula makes sense