2. (7 points) Irish writer Lewis once wrote an ironic fable, in which he described a barbarous country called Niatopo. In this country, they use Sibabab numbers. The shape of Sibabab numbers is the same as the commonly used Arabic numerals, but their meanings are reversed. For example, “0” represents “9”, “1” represents “8”, and so on. They write numbers from left to right, and the operation symbols they use are the same as ours. For example, they use 62 to represent what we write as 37. According to the custom of the Niatopo people, how should the sum of $837+742$ be written? $\qquad$
【Analysis】“0” represents “$9”, 0+9=9, “1” represents “8”, $1+8=9$, from this we can infer that the sum of the numbers represented by the Sibababa numerals and the normal numbers is always 9; thus, we can find the numbers represented by $837$ and $742$, and then add them together.

【Solution】Solution: The Sibababa numeral 8 represents the Arabic numeral $9-8=1$,
The Sibababa numeral 3 represents the Arabic numeral $9-3=6$,
The Sibababa numeral 7 represents the Arabic numeral $9-7=2$,
The Sibababa numeral 4 represents the Arabic numeral $9-4=5$,
The Sibababa numeral 2 represents the Arabic numeral $9-2=7$,
Therefore, $837+742$ represents the normal equation: $162+257=419$.
The answer is: 419.