word count is not working in treehouse but it works on my terminal

def word_count(gotcha):
    gotcha = gotcha.lower().split()
    tu = []
    ta = gotcha
    sq = 0
    do = []
    total = []
    dic = {}

    for i in range(0,len(gotcha)):
        sq = 0
        do = []
        while sq < len(gotcha):
            if gotcha[i] == ta[sq] and gotcha[i] not in tu:
                do.append(gotcha[i])
                tu.append(gotcha[i])
                sq += 1
            elif gotcha[i] == ta[sq] and gotcha[i] in tu:
                do.append(gotcha[i])
                sq += 1
            elif gotcha[i] != ta[sq]:
                sq += 1
        while sq == len(gotcha):
            dic[gotcha[i]] = len(do)
            if gotcha[i] + str(len(do)) not in total:
                total.append(gotcha[i] + str(len(do)))
            sq += 1
    return dic
wordcount = word_count("I DO not like it SAM I AM") ```