4.2_k

f = open('data.txt', 'r')
r = open('result.txt', 'w')

max_mark = 0
min_mark = 100

for line in f:
    lesson1 = line[line.find('-')+2:line.find(':')]
    break

for line in f:
    if lesson1 in line:
        mark = int(line[line.find(':')+2:-1])

        if mark > max_mark:
            max_mark = mark

            if ' '+str(max_mark)+'\n' in line:
                a = line

        if min_mark > mark:
            min_mark = mark

            if ' '+str(min_mark)+'\n' in line:
                b = line

print(a, b)

f.close()
r.close()