Problem #PRU-65600

Problem

A robot came up with a cipher for writing words: he replaced some letters of the alphabet with single-digit or two-digit numbers, using only the digits 1, 2 and 3 (different letters it replaces with different numbers). First, he wrote down, using the cipher: $ROBOT=3112131233$. Having encrypted the words $CROCODIL$ and $BEGEMOT$, he was surprised to note that the numbers were completely identical! Then the Robot ciphered the word $MATHEMATICS$. Write down the number that he got.