Python code to insert an alphabet in a string

string_insert.py

# Store any word
string = input("Enter any word: ")

# Ask where to insert before
index_Alpha = input("Where do you want to insert?\nEnter Alphabet: ")

# Int to store string index no
index_No = 0

# Iterate until char matches, get index no
for i in range(len(string)):

    # If matches
    if string[i] == index_Alpha:
        
        # Ask for alpha to insert
        new_Alpha = input("Alphabet to insert: ")

        # Get index no
        index_No = i
        break

# List to store new string
new_string = []

# Copy each char from old string to new string
for j in range(len(string)):

    new_string.insert(j, string[j])

# Insert new char at index no declared above
new_string.insert(index_No, new_Alpha)

# Print each char on screen
for k in range(len(new_string)):
    print(new_string[k], end="")

# Print new-line, exit the program
print("")
exit(0)