# return a dictionary in which the keys are bird types and the associated values are
# the numbers of times that bird type appears in the input file.
#
def makeBirdDict(fileName):
    birdDict = {}
    inFile = open(fileName, 'r')

    # for each bird type read from file, if already in dictionary,
    # increment the associated count, otherwise add it to
    # dictionary with count of 1.
    for line in inFile:
        birdType = line.strip()
        if birdType in birdDict:
            birdDict[birdType] = birdDict[birdType] + 1
        else:
            birdDict[birdType] = 1
    inFile.close()
    return(birdDict)

# Given a dictionary of the form returned by makeBirdDict, print
# information about the most seen bird, i.e. the bird type with highest associated value
#
def mostSeenBird(birdDict):
    mostSeenBird = None
    mostSeenCount = None
    for key in birdDict:
        if (mostSeenCount == None) or (birdDict[key] > mostSeenCount):
            mostSeenBird = key
            mostSeenCount = birdDict[key]
    print("The most seen bird was '{}', sighted {:d} times.".format(mostSeenBird, mostSeenCount))