Converting Prefix notations of basic maths ops to Infix and writing them to a file viz. filename.out

# The Python File Consists of the follwing...

def file_math(filename):
    with open(rf"{filename}.in") as file0:
        data = file0.readlines()

    with open(rf"{filename}.out", 'w') as file:
        for i in data:
            L1 = i.split()

            if L1[0] in ('ADD', 'SUB', 'MUL', 'POW'):
                if L1[0] == 'ADD':
                    file.write(f"{L1[1]} + {L1[2]} = {int(L1[1])+int(L1[2])}\n")
                elif L1[0] == 'SUB':
                    file.write(f"{L1[1]} - {L1[2]} = {int(L1[1])-int(L1[2])}\n")
                elif L1[0] == 'MUL':
                    file.write(f"{L1[1]} X {L1[2]} = {int(L1[1])*int(L1[2])}\n")
                elif L1[0] == 'POW':
                    file.write(f"{L1[1]} ^ {L1[2]} = {int(L1[1])**int(L1[2])}\n")
            else:
                file.write("Invalid Operation\n")

    print("File Successfully Read and Written...")

file_math("filename")

# Contents of the file named "filename.in"
ADD 34 56
SUB 28 35
MUL 30 45
POW 23 45
CHK 23 34
MOD 23 45