# Write a Python program to Group Elements in Matrix 
 # Python3 code to demonstrate working of 
# Group Elements in Matrix
# Using dictionary comprehension + loop
  
# initializing list
test_list = [[5, 8], [2, 0], [5, 4], [2, 3], [7, 9]]
  
# printing original list
print("The original list : " + str(test_list))
  
# initializing empty dictionary with default empty list 
res = {idx[0]: [] for idx in test_list}
  
# using loop for grouping
for idx in test_list:
    res[idx[0]].append(idx[1])
  
# printing result 
print("The Grouped Matrix : " + str(res))