#
# Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
#
# Example 1:
# Input: haystack = "hello", needle = "ll"
# Output: 2
#
# Example 2:
# Input: haystack = "aaaaa", needle = "bba"
# Output: -1
#
# Clarification:
# What should we return when needle is an empty string? This is a great question to ask during an interview.
# For the purpose of this problem, we will return 0 when needle is an empty string.

def strStr(haystack, needle):
    return haystack.find(needle)

print(
strStr("hello", "ll")
)


haystack = "asdada"
needle = ""
print(strStr(haystack, needle))
# Output: -1
