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Neighbors of the same sign

Statement

Given a list of numbers, find and print the first adjacent elements which have the same sign. If there is no such pair, leave the output blank.

In all the problems input the data using input() and print the result using print(). 

# Read an integer:
# a = int(input())
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Input:
-1 2 3 -1 -2
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Output:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Saved solutions

Tests

InputCorrect answer
-1 2 3 -1 -2
2 3
1 -3 4 -2 1
1 2 -3 -4 -5
1 2
1 -2 3 -4 -5
-4 -5
1 -2 3 -4 5 6
5 6
-1 2 -3 4 -5 6
1 -2 3 -4 5 -6
1 -2 3 -4
-1 2 -3 4
1 2 3 4
1 2
-1 -2 -3 -4
-1 -2
1 -1 1 -1 -1 1 -1 1 -1 1
-1 -1
1 -1 1 -1 1 1 -1 1 -1 1
1 1
1 -1 1 -1 1
-1 1 -1 1 -1