I have no idea why "For does'nt work

""" In the for loop below, ncount +=1 ucount += 1 l_count += 1 dosen't work.

I have no idea. Need help.

"""

def checkio(data: str) -> bool:
    n_count = 0
    u_count = 0
    l_count = 0

    check = data
    if len(check) > 10:
        for char in check:
            if '1234567890' in char:
                n_count += 1
            if 'QWERTYUIOPASDFGHJKLZXCVBNM' in char:
                u_count += 1
            if 'qwertyuiopasdfghjklzxcvbnm' in char:
                l_count += 1

        if n_count > 0:
            if u_count > 0:
                if l_count > 0:
                    r = True
        else:
            r = False
    else:
        r = False
    return r