Picture：

#include<iostream>
using namespace std;
#define N 1000
char str[N][N];
int main(){
    int width,height;
    while(cin>>width>>height){
        int i,j;
        for(i=0;i<N;++i)
            for(j=0;j<N;++j)
                str[i][j]=' ';
        str[1][1]='+';
        str[1][width+2]='+';
        str[height+2][1]='+';
        str[height+2][width+2]='+';
        for(i=2;i<=width+1;++i)
            str[1][i]='-';
        for(i=2;i<=height+1;++i)
            str[i][1]='|';
        for(i=2;i<=height+1;++i)
            str[i][width+2]='|';
        for(i=2;i<=width+1;++i)
            str[height+2][i]='-';
        for(i=1;i<=height+2;++i){
            for(j=1;j<=width+2;++j){
                cout<<str[i][j];
                if(j==width+2)
                    cout<<endl;
            }
        }
        cout<<endl;
    }
    return 0;
}