print("***样例***")
for i in range(2):
    for j in range(2):
        flag1=(j!=1)
        flag2=(1+1==9)
        if (i==1 and flag1 or i==0 and not flag1) and (j==1 and flag2 or j==0 and not flag2):
            print("甲是%d，乙是%d"%(i,j))

print("***练习***")
for i in range(2):
    for j in range(2):
        __________
        __________
        if __________:
            print("甲是%d，乙是%d"%(i,j))