答There are several ways to approach this problem, but one possible solution is to use a loop to iterate through each character in the input string and check if it is a digit. If it is, add it to a new string variable. Finally, convert the new string variable to an integer and return it.Here is an example implementation in Python:```pythondef extract_digits: digits = "" for char in input_string: if char.isdigit(): digits += char return intinput_string = "abc123def456"result = extract_digitsprint # Output: 123456```In this example, the `extract_digits` function takes an input string as a parameter. It initializes an empty string variable called `digits` to store the extracted digits. Then, it iterates through each character in the input string using a for loop. If the current character is a digit , it is added to the `digits` string. Finally, the `digits` string is converted to an integer using the `int` function and returned.

答There are several ways to approach this problem, but one possible solution is to use a loop to iterate through each character in the input string and check if it is a digit. If it is, add it to a new string variable. Finally, convert the new string variable to an integer and return it.Here is an example implementation in Python:```pythondef extract_digits(input_string): digits = "" for char in input_string: if char.isdigit(): digits += char return int(digits)input_string = "abc123def456"result = extract_digits(input_string)print(result) # Output: 123456```In this example, the `extract_digits` function takes an input string as a parameter. It initializes an empty string variable called `digits` to store the extracted digits. Then, it iterates through each character in the input string using a for loop. If the current character is a digit (determined using the `isdigit` method), it is added to the `digits` string. Finally, the `digits` string is converted to an integer using the `int` function and returned.