#include <bits/stdc++.h>
using namespace std;
string t,s1,s2;
long long a[5000000],c[3000005],b1,b[10000000],m,aa,bb,cc;
char jjjjj,iiiii,go;
int jia(){
	cin>>s1>>s2;
	cout<<"和：";
	aa=s1.size();
	bb=s2.size();
	for(int i=0;i<aa;i++){
		a[i]=s1[aa-i-1]-'0';
	}
	for(int i=0;i<bb;i++){
		b[i]=s2[bb-i-1]-'0';
	}
    cc=max(aa,bb)+1;
	for(int i=0;i<cc;i++){
		c[i]=a[i]+b[i];
	}
	for(int i=0;i<cc;i++){
		if(c[i]>=10){
			c[i+1]+=c[i]/10;
			c[i]=c[i]%10;
		}
	}
	while(c[cc-1]==0&&cc>1){
		cc--;
	}
	for(int i=cc-1;i>=0;i--)cout<<c[i];
	return 0;
}
int jian(){
	cin>>s1>>s2;
	cout<<"差：";
	if(s1.size()<s2.size()||s1.size()==s2.size()&&s1<s2){
		swap(s1,s2);
		cout<<"-";
	}
	aa=s1.size();
	bb=s2.size();
	for(int i=0;i<aa;i++){
		a[i]=s1[aa-i-1]-'0';
	}
	for(int i=0;i<bb;i++){
		b[i]=s2[bb-i-1]-'0';
	}
    cc=max(aa,bb);
	for(int i=0;i<cc;i++){
		c[i]=a[i]-b[i];
	}
	for(int i=0;i<cc;i++){
		if(c[i]<b[i]){
			a[i]+=10;
			a[i+1]--;
		}
		c[i]=a[i]-b[i];
	}
	while(c[cc-1]==0&&cc>1){
		cc--;
	}
	for(int i=cc-1;i>=0;i--)cout<<c[i];
	return 0;
}
int chu(){
	cin>>t>>b1;
	while(b1==0){
		cout<<"0不可以做除数!,请再输入一遍";
		cin>>t>>b1;
	}
	cout<<"商：";
	for(int i=0;i<t.size();i++){
		a[i]=t[i]-'0';
	}
	for(int i=0;i<t.size();i++){
		c[i]=(m*10+a[i])/b1;
		m=(m*10+a[i])%b1;
	}
    int j=0;
	while(c[j]==0&&j<t.size()-1){
		j++;
	}
	for(int i=j;i<t.size();i++)cout<<c[i];
	cout<<endl<<"余数："<<m;//余数
	return 0;
}
int cheng(){
	cin>>s1>>s2;
	cout<<"积：";
	aa=s1.size();
	bb=s2.size();
	for(int i=0;i<aa;i++){
		a[i]=s1[aa-i-1]-'0';
	}
	for(int i=0;i<bb;i++){
		b[i]=s2[bb-i-1]-'0';
	}
    cc=aa+bb;
	for(int i=0;i<aa;i++){
		for(int j=0;j<bb;j++){
			c[i+j]+=a[i]*b[j];
			if(c[i+j]>=10){
				c[i+j+1]+=c[i+j]/10;
				c[i+j]%=10;

			}
		}
	}
	while(c[cc-1]==0&&cc>1){
		cc--;
	}
	for(int i=cc-1;i>=0;i--)cout<<c[i];
	return 0;
}
int main(){
	cin>>go;
	if(go=='/'){
		chu();
		return 0;
	}
	if(go=='*'){
		cheng();
		return 0;
	}
	if(go=='-'){
		jian();
		return 0;
	}
	if(go=='+'){
		jia();
		return 0;
	}
	cin>>jjjjj>>iiiii;
	while(go!='/'||go!='*'||go!='-'||go!='+'){
		if(go=='/'){
			chu();
			return 0;
		}
		if(go=='*'){
			cheng();
			return 0;
		}
		if(go=='-'){
			jian();
			return 0;
		}
		if(go=='+'){
			jia();
			return 0;
		}
		cout<<"符号错误，再输入一遍！";
		cin>>go;
	}
	return 0;
}