#leo
def endswith_case_insensitive(s, suffix):
    """s and suffix are stings
    returns True if s ends with suffix, case insensitive"""
    return s.lower().endswith(suffix.lower())
#sharma++
def endswith_case_insensitive(s, suffix):
    suffix = suffix.lower()
    s = s[len(s)-len(suffix):len(s)]
    #print(s)
    #print(suffix)
    return s == suffix
# boolean ipsa loquitor.  POLLARD
def occurs_twice(s, ch):
    """s is a string, ch is a one-character string
    return True if ch occurs at least twice in s."""
    if s.count(ch) > 1:
         return True
    else:
         return False
#Pollard++;
def occurs_twice(s, ch):
    """s is a string, ch is a one-character string
    return True if ch occurs at least twice in s."""
    return s.count(ch) > 1
def occurs_twice(s, ch):
    first = s.find(ch)
    last = s.rfind(ch)
    return not(first==last)
    # return first != last
    # return first < last
def median(x):
    """ x is a numerical list with an odd number of items
    returns the median of x"""
    #pittenger
    x = sorted(x)
    return x[len(x)//2]
def median(x):
    """ x is a numerical list with an odd number of items
    returns the median of x"""
    #pittenger
    x.sort()
    return x[len(x)//2]

#vester
def format_name(first, last, middle):
    """ first, last are strings (name)
    return a sring for the form "last, first (middle initial)."""
    return last + ", " + first + " " + middle[0] + "."
#paul warner
def format_name(first, last, middle):
    return f"{last}, {first} {middle[0]}."
def format_name(first, last, middle):
    return "{0}, {1} {2}.".format(last, first, middle[0])
def format_name(first, last, middle):
    return "%s, %s %s." % (last, first, middle[0])
print(endswith_case_insensitive("flibbertygibbet", "BeT"))
print(format_name("John", "Morrison", "Michael"))
x = [5,3,9,-2,7]
print(x)
print(median(x))
print(x)