using System.Linq;class P{static void Main(){var a=new[]{System.Console.ReadLine(),System.Console.ReadLine()};var p=new P();string m=p.S(a[0]),n=p.S(a[1]);var l=m.Length+n.Length;var r=p.s+p.C(Enumerable.Range(0,l).Reverse().Select(j=>n.Reverse().Select((y,i)=>(p.C(m.Reverse().Select(z=>(y-48)*(z-48)).ToArray())+new string('0',i)).PadLeft(l,'0')).Select(s=>s[j]-48).Sum()).ToArray()).TrimStart('0');System.Console.WriteLine(r!=""?r:"0");}string C(int[]e){var i=0;var r="";foreach(var z in e.Select(z=>z+i)){i=z/10;r=z%10+r;}return i+r;}string s="";string S(string a){if(!a.StartsWith("-"))return a;s=s==""?"-":"";return a.Substring(1);}}

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