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conflictflag = False

course = [[] for _ in range(3)]
for i in range(3):
    lesson1 = int(input())
    timea = int(input())
    timeb = int(input())
    course[i].append(lesson1)  
    course[i].append(timea)    
    course[i].append(timeb)    

course.sort()

def check():
    global conflictflag
    answerset = [] 
    for i in range(3):
        for j in range(i + 1, 3):
            for time1 in course[i][1:]:
                for time2 in course[j][1:]:
                    if time1 == time2:
                        conflictflag = True
                        answer1 = course[i][0]
                        answer2 = course[j][0]

                        answerset.append((min(answer1, answer2), max(answer1, answer2), time1))
    answerset.sort(key=lambda x: x[2])

    for answer in answerset:
        print("{} and {} conflict on {}".format(answer[0], answer[1], answer[2]))

check()

if not conflictflag:
    print("correct")