while(1):
    try:
        num=list(map(int,input().split()))
        t=dict()
        ma=0
        for i in num:
            if i in t:
                t[i]+=1
                ma=max(ma,t[i])
            else:
                t[i]=1
                ma=max(ma,t[i])

        k=sorted(t)
        for i in k:
            if(ma==t[i]):
                print(i)
                break
    except:
        break