import sys
input = sys.stdin.readline

x1,x2=map(int,input().split())

def two_five(x):
    A=0
    while x%2==0:
        A+=1
        x//=2

    B=0
    while x%5==0:
        B+=1
        x//=5

    return [A,B]

x1=two_five(x1)
x2=two_five(x2)

def calc(x):
    return pow(2,x[0])*pow(5,x[1])

if (x1[0]+x1[1]-x2[0]-x2[1])%2==1:

    while x1!=x2:
        if x1[0]+1<x2[0]:
            x1[0]+=1
            print(calc(x1),flush=True)

            if x1==x2:
                break
                

            k=int(input())
            x2=two_five(k)

        elif x1[0]>x2[0]+1:
            x1[0]-=1
            print(calc(x1),flush=True)

            if x1==x2:
                break

            k=int(input())
            x2=two_five(k)

        else:
            if x1[1]+1<x2[1]:
                x1[1]+=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break
             
                k=int(input())
                x2=two_five(k)
                
            else:
                x1[1]-=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break

                k=int(input())
                x2=two_five(k)

else:
    t=[7,9]
    while x1!=t and x1!=x2:
        if x1[0]<t[0]:
            x1[0]+=1
            print(calc(x1),flush=True)

            if x1==x2:
                break
                

            k=int(input())
            x2=two_five(k)

        elif x1[0]>t[0]:
            x1[0]-=1
            print(calc(x1),flush=True)

            if x1==x2:
                break

            k=int(input())
            x2=two_five(k)

        else:
            if x1[1]<t[1]:
                x1[1]+=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break
             
                k=int(input())
                x2=two_five(k)
                
            else:
                x1[1]-=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break

                k=int(input())
                x2=two_five(k)
    if x1==x2:
        sys.exit()

    x1=[9,9]
    print(calc(x1),flush=True)

    if x1==x2:
        sys.exit()
        
    k=int(input())
    x2=two_five(k)

    while x1!=x2:
        if x1[0]+1<x2[0]:
            x1[0]+=1
            print(calc(x1),flush=True)

            if x1==x2:
                break
                

            k=int(input())
            x2=two_five(k)

        elif x1[0]>x2[0]+1:
            x1[0]-=1
            print(calc(x1),flush=True)

            if x1==x2:
                break

            k=int(input())
            x2=two_five(k)

        else:
            if x1[1]+1<x2[1]:
                x1[1]+=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break
             
                k=int(input())
                x2=two_five(k)
                
            else:
                x1[1]-=1
                print(calc(x1),flush=True)
                
                if x1==x2:
                    break

                k=int(input())
                x2=two_five(k)