(https://www.acmicpc.net/problem/22193)
Write a program that computes a product of two non-negative integers A and B. The integers are represented in decimal notation and have N and M digits, respectively.
The first line contains the lengths N and M, separated by a space. A is given on the second and B on the third line. The numbers will not have leading zeros.
Output the product of A and B without leading zeros.
n,m = map(int,input().split())
a = int(input())
b = int(input())
print(a*b)