s = 'gfdhbobobyui'
bob = 0
for x in range(len(s) -3):
if s[x:x+3] == 'bob': # From x to three 3 characters ahead.
bob += 1
print('Number of times bob occurs is: ' + str(bob))
cyA9ICdnZmRoYm9ib2J5dWknCmJvYiA9IDAKZm9yIHggaW4gcmFuZ2UobGVuKHMpIC0zKToKICAgICBpZiBzW3g6eCszXSA9PSAnYm9iJzogICMgRnJvbSB4IHRvIHRocmVlIDMgY2hhcmFjdGVycyBhaGVhZC4KICAgICAgICAgYm9iICs9IDEKcHJpbnQoJ051bWJlciBvZiB0aW1lcyBib2Igb2NjdXJzIGlzOiAnICsgc3RyKGJvYikp