5.1. Provide any solution to the riddle: 2014 + YEAR = SOCHI. (Different letters represent different digits.)
Answer: $2014+891=2905$ or $2014+893=2907$ or $2014+896=2910$.

Notice that from the addition of the hundreds place, it follows that the addition of the tens place is carried over, and therefore $\mathrm{O}=8$ (and there was a carry in the units place) or $\mathrm{O}=9$.

# Evaluation criteria:

+ one or more correct answers are provided

$\pm$ several answers are provided, among which there are both correct and incorrect ones

- only an incorrect answer is provided