leetcode 1702B - Polycarp Writes a String from Memory

def sol(s):
    cnt=0
    days=1
    string_list = []
    for i in s:
        if i in string_list:
            pass
        else :
            if cnt>=3:
                cnt=0
                days+=1
                string_list = []
            string_list.append(i)
            cnt+=1
    return days
for i in range(int(input())):
    print(sol(input()))