5. A five-digit number $\overline{a b c d e}$, from the five digits, any two digits are taken to form a two-digit number (maintaining the original order of the digits in the five-digit number), there are 10 such two-digit numbers: $33, 37, 37, 37, 38, 73, 77, 78, 83, 87$, then $\overline{a b c d e}=$ $\qquad$ -
【Answer】 37837