content = []
with open("stuff.txt", "r") as file:
    while True:
        line = [file.readline()]
        if not line[0]:
            break;
        line[0] = line[0].strip()
        file.readline()
        line.append(file.readline().strip().replace("-",""))
        file.readline()
        content.append(line)

seen = {}

for verf in content:
    if verf[1] not in seen.keys():
        seen[verf[1]] = verf[0]
    else:
        seen.pop(verf[1])

for kr, verf in seen.items():
    print(verf, kr)