Shell Not Able Read Files Written with Python

I made a python file which tells every .java file in the folder it is placed in and you can select which java file to execute, the selected java file's name is then written in a file named Input.txt, But i cannot read that file in shell:

My Python File:

import glob, os
import sys
a=sys.path
count=0
os.chdir(a[0])
ifile=open("Input.txt","w")
i=1
for file in glob.glob("*.java"):
    if(count%2==0):
        print(i,".",file,end="")
        g=str(i)
        l=len(file)+len(g)
    else:
        print("".rjust(40-l,' '),i,".",file)
    i=i+1
    count=count+1
print("")
flag=1
while flag==1:
    f=int(input("Enter The File No. You Want To Execute:"))
    i=1
    for file in glob.glob("*.java"):
        if(i==f):
            flag=0
            x=file
            break
        i=i+1
    if flag==1:
        print("File Not Found!!\nPlease Enter Again:")
ifile.write(x)
ifile.close()

The shell file looks like this:

#!/bin/bashs
echo WELCOME TO EXECUTOR
echo Garvit Joshi\(\)
echo USER:$USERNAME
python3 Filename_java.py
filename="Input.txt"
while IFS= read -r line
do
        echo "$line"
done <"$filename"
exit

edit 1:Please Do not go through algorithm of python file.It works fine.