Deep Space Distance Tally

A deep-space relay station receives two independent readings of the distance to a target beacon. Each reading arrives as a string of decimal digits with no sign, no separators, and no leading zeros (unless the reading is exactly the single digit 0). Because a reading can be far longer than any native 64-bit integer can hold, the station's onboard software adds the two readings together digit by digit, exactly the way you would add two numbers by hand on paper. Compute the exact decimal sum of the two readings.

Input format

The input consists of two whitespace-separated tokens:

• num1 — the first distance reading, a non-empty string of decimal digits.
• num2 — the second distance reading, a non-empty string of decimal digits.

Output format

Print a single line containing the decimal string representing num1 + num2, with no leading zeros (the value zero itself is printed as 0).

Constraints

• 1 <= length of num1, length of num2 <= 10000
• Each of num1 and num2 consists only of the digits 0-9.
• Neither num1 nor num2 contains a leading zero, unless the string is exactly "0".

99 1

100

456 77

533