text = "ab23cd5ef17gh"

numbers = [int(ch) for ch in text if ch.isdigit()]

def is_prime(n):
    if n < 2:
        return False
    for i in range(2, int(n**0.5)+1):
        if n % i == 0:
            return False
    return True


prime_count = sum(is_prime(num) for num in numbers)
print(numbers)
print(prime_count)