import sys

numA = numB = numC = numD = numF = 0

for grade in open(sys.argv[1], "r"):
    grade = int(grade)
    if (grade >= 80):
        numA += 1
    elif ((grade >= 65) and (grade < 80)):
        numB += 1
    elif ((grade >= 55) and (grade < 65)):
        numC += 1
    elif ((grade >= 50) and (grade < 55)):
        numD += 1
    else:
        numF += 1

print "Grades: ", numA, "As /", numB, "Bs / ", numC, "Cs / ", \
      numD, "Ds / ", numF, "Fs / "