# Program to Find the sum of a lower triangular matrix # Get size of matrixrow_size=int(input("Enter the row Size Of the Matrix:"))col_size=int(input("Enter the columns Size Of the Matrix:"))matrix=[]# Taking input of the matrixprint("Enter the Matrix Element:")for i in range(row_size):    matrix.append([int(j) for j in input().split()])#Calculate sum of lower triangular matrix elementsum=0for i in range(len(matrix)):    for j in range(len(matrix[0])):        if i<j:            sum += matrix[i][j]# display the sum of a lower triangular matrix elementprint("Sum of Lower Triangular Matrix Elements is: ",sum)