#include #include <bits/stdc++.h> using namespace std; #define LL long long const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int s1[N],s2[N],s3[N],cnt=0; int main(){ string a,b; cin>>a>>b; int lena=a.size(),lenb=b.size();//123456789 for(int i = 0 ; i < lena ; i++){ s1[i] = a[lena - i - 1] - '0';//987654321 } for(int i = 0 ; i < lenb ; i++){ s2[i] = b[lenb - i - 1] - '0'; } int z=max(lena,lenb); for(int i=0;i<z;i++){ if(s1[i]+s2[i]>=10){ s3[i]=s2[i]+s1[i]-10; s1[i+1]++; if(i==z-1) cnt++; }else s3[i]=s1[i]+s2[i];

}

if(cnt>0){
	cout<<1;
}
for(int i=z-1;i>=0;i--){
	cout<<s3[i];
}

}

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int s1[N],s2[N],s3[N],cnt=0;
int main(){
	string a,b;
	cin>>a>>b;
	int lena=a.size(),lenb=b.size();//123456789 
	for(int i = 0 ; i < lena ; i++){
		s1[i] = a[lena - i - 1] - '0';//987654321
	}
	for(int i = 0 ; i < lenb ; i++){
		s2[i] = b[lenb - i - 1] - '0';
	}
	int z=max(lena,lenb);
	for(int i=0;i<z;i++){
		if(s1[i]+s2[i]>=10){
			s3[i]=s2[i]+s1[i]-10;
			s1[i+1]++;
			if(i==z-1) cnt++;
		}else s3[i]=s1[i]+s2[i];
		
	}
	
	if(cnt>0){
		cout<<1;
	}
	for(int i=z-1;i>=0;i--){
		cout<<s3[i];
	}
}

#include<bits/stdc++.h> using namespace std; string a1,b1; int a[505],b[505],c[100005]; int lena,lenb,lenc; int main() { cin>>a1>>b1; lena=a1.size(); lenb=b1.size(); for(int i=1;i<=lena;i++) a[i]=a1[lena-i]-'0'; for(int i=1;i<=lenb;i++) b[i]=b1[lenb-i]-'0'; int x=0; for(int i=1;i<=lena;i++) { x=0; for(int j=1;j<=lenb;j++) { c[i+j-1]+=a[i]*b[j]+x; x=c[i+j-1]/10; c[i+j-1]%=10; } c[i+lenb]=x; }

lenc=lena+lenb;					
while(c[lenc]==0&&lenc>1)
	lenc--; 
for(int i=lenc;i>=1;i--) 
{
	cout<<c[i]; 
}	
return 0;

}