1. Basic Arithmetic Operations

Read two integers $A$ and $B$ from standard input. Compute and print their sum, difference, product, quotient, and remainder.

If $B = 0$, division and modulo operations are mathematically undefined; in such cases, output undefined for both quotient and remainder.

A single line containing two space-separated integers $A$ and $B$.

Print exactly 5 lines:

• •Line 1: $A + B$ (sum)
• •Line 2: $A - B$ (difference)
• •Line 3: $A \times B$ (product)
• •Line 4: $A / B$ (integer quotient truncated toward zero) or undefined if $B = 0$
• •Line 5: $A \pmod B$ (remainder) or undefined if $B = 0$