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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