# ------------------
# 2 
def startswith(s1, s2):
    for i in range(len(s2)):
        if s1[i] != s2[i]:
            return False
        
    return True


# ------------------
# 5
import random

def random_test(max, threshold, num):
    count = 0
    
    for i in range(num):
        rand = random.randint(0, max)
        
        if rand <= threshold:
            count += 1
            
    return count
# ------------------
# 8
import random

def random_DNA(num):
    seq = ""
    
    for i in range(num):
        rand = random.randint(0, 3)
        
        if rand == 0:
            seq += "A"
        elif rand == 1:
            seq += "C"
        elif rand == 2:
            seq += "G"
        else:
            # rand == 3
            seq += "T"
    
    return seq

# ------------------
# 10

def stringToIntList(s):
    result = []
    
    for char in s:
        result.append(int(char))
        
    return result