from sys import stdin
input=stdin.readline

def main():
    N=int(input())
    K = [int(x) for x in input().split()]
    a=b=0
    for k in K:
        if k==4:
            b-=1
        elif k==5:
            b+=1
        elif k==0:
            a+=1
            b=b*3
        elif k==1:
            a+=1
            b=b*3+1
        elif k==2:
            a+=1
            b=b*3+2
        elif k==3:
            a-=1
            b//=3
    print(a)
    res=[]
    while b:
        res.append(str(b%3))
        b//=3
    if len(res)!=0:
        print(''.join(res[::-1]))
    else:
        print(0)
        
main()