F. Fair Toy Missing
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Alice and Bob each bought a bag of toys at the city fair. Each toy bag is supposed to contain exactly 5 different toys, and every bag sold at the fair has the same set of toys.

When they got home and opened their bags, Alice discovered that her bag had all 5 toys, as expected. However, Bob found that his bag only contained 4 toys! He wants to return to the fair to complain, but before doing so, he needs to figure out which toy is missing from his bag.

Your task is to help Bob identify the missing toy.

Input

The first line of input contains 5 integer numbers separated by a space, the toys in Alice's bag.

The second line of input contains 4 integer numbers separated by a space, the toys in Bob's bag.

Each toy is represented by an integer value between 1 and 100, inclusive.

Output

Print a line with a single integer, the toy that is missing in Bob's bag.

Examples
Input
1 2 3 4 5
2 4 5 1
Output
3
Input
10 14 22 32 1
10 14 22 32
Output
1