from random import randint
sequence = [randint(0, 100) for i in range (20)]
print(sequence)

number = int(input( "which number should I look for?"))
position = 0
found = False
samler = []
while position < len(sequence):
    if sequence[position] == number:
        samler.append(position)
        found = True
        position += 1
    else:
       position += 1
if found == False:
    print("your number is not in the sequence")
else:
    print("your number is in positión {}".format(samler))