# 
# Simple tests: 
# 
9 7 8 9 
9 9 8 7 
9 9 8 9 
# 
# Negative number tests: 
# 
-7 -7 -8 -9 
-7 -8 -7 -8 
-7 -9 -7 -8 
# 
# Mixture: 
# 
7 -9 -7 -8 7 6 4 
9 -1 0 9 -7 4 
# 
# Boundary conditions: 
# 
1 1 
0 0 
2147483647 2147483647 
-2147483648 -2147483648