#PROBLEM 1
def pair(l1):
    list1 = l1
    ctr = 0
    result = []

    while ctr < len(list1):
        result.append(str(list1[ctr]))
        if ctr+2<len(list1):
            result[ctr/4] += "," + str(list1[ctr+2])
        ctr += 4
    return result

#PROBLEM 2
def replace(l1,l2):
    string1 = l1
    char = l2
    ctr = 0
    while ctr < len(string1):
        if string1[ctr] == l2:
            string1[ctr] == "q"
    return string1