with open('input.txt') as f:
    x = f.readlines()
    m = {}
    for s in x:
        p = s.strip().split(',')
        m1 = {}
        for i in range(len(p)):
            for j in range(i + 1, len(p)):
                pair = (min(p[i], p[j]), max(p[i],p[j]))
                if(p[i] == p[j]):
                    continue
                if(pair in m1):
                    m1[pair] += 1
                else:
                    m1[pair] = 1
        for i in m1.items():
            if(i[0] in m):
                m[i[0]] += 1
            else:
                m[i[0]] = 1
    mx = 0
    res = ('{', '{')
    for i in m.items():
        if(mx == i[1]):
            mx = i[1]
            res = min(res, i[0])
        elif(mx < i[1]):
            res = i[0]
            mx = i[1]
    print(str(res[0]) + ',' + str(res[1]))