Functions - Matrix - Subtraction

# Functions and Matrix
# Matrix Subtraction

# Function - Read Matrix
def fn_read(r, c):
    M = []
    print("Enter values of Matrix : ")
    for i in range(0,r,1):
        tmp = []
        for j in range(0,c,1):
            ele = int(input())
            tmp.append(ele)
        M.append(tmp)
    return M

# Function - Display Matrix
def fn_display(M):
    for row in M:
        for ele in row:
            print(ele, end=" ")
        print()

# Function - Matrix Subtraction
def fn_sub(MA, MB, r, c):
    M = []
    for i in range(0,r,1):
        tmp = []
        for j in range(0,c,1):
            ele = MA[i][j] - MB[i][j]
            tmp.append(ele)
        M.append(tmp)
    return M
   
# Main Program

import sys

Mat_A = []
Mat_B = []
Mat_Sub = []

print("Enter number of rows and columns :")
r1 = int(input("Matrix 1 - Row : "))
c1 = int(input("Matrix 1 - Column : "))
r2 = int(input("Matrix 2 - Row : "))
c2 = int(input("Matrix 2 - Column : "))

# Subtraction
if ( (r1 != r2) or (c1 != c2) ):
    print("Rows and columns of given matrices do not match.")
    print("Cannot Subtract the matrices.")
else:
    Mat_A = fn_read(r1, c1)
    Mat_B = fn_read(r2, c2)
   
    print("Given matrix 1 : ")   
    fn_display(Mat_A)
    print("Given matrix 2 : ")   
    fn_display(Mat_B)
   
    Mat_Sub = fn_sub(Mat_A, Mat_B, r1, c1)
    print("Difference of given matrices : ")
    fn_display(Mat_Sub)