bool = "Yes"
while(true)
    s = gets.chomp.split("")
    next if(s.length < 2 || s.length > 100)
    break;
end
s.length.times do|i|
    if((i+1) % 2 == 0)
        if((i+1) % 2 != 0)
            bool = "No"
            break
        end
    end
end
print(bool)