'''
# 41.
ticker = "btc_krw"
print(ticker.upper())


# 42.
ticker = "btc_krw"
print(ticker.lower())


# 43.
a = "hello"
print(a.capitalize())


# 44.
a = "BlockDMask"
print(a.swapcase())


# 45.
file_name = "보고서.xlsx"
print(file_name.endswith(("xlsx", "xls")))

file_name = "2020_보고서.xlsx"
print(file_name.startswith("2020"))


# 46.
a = "hello world"
print(a.split())


date = "2020-05-01"
print(date.split("-"))


# 47.
data = "039490      "
print(data.rstrip())



# 48.
a = "가나다라마바사"
print(a.find('나'))
print(a.find('다', 1))
print(a.find('가', 3))
'''