#include using namespace std; int main() { int a,b; char ch; bool x; int i,j;

cin>>a>>b;
cin>>ch;
cin>>x;

if(x)
{
    for(i=1; i<=a; i++)
    {
        for(j=1; j<=b; j++)   cout<<ch;
        cout<<endl;
    }
}
else
{
    for(i=1; i<=a; i++)
    {
        for(j=1; j<=b; j++)
        {
            if((i==1)||(i==a)||(j==1)||(j==b))//四条边均按条件输出
                cout<<ch;
            else
                cout<<" ";
        }
        cout<<endl;
    }
}
cout<<endl;
return 0;

}

#include <iostream>
using namespace std;
int main()
{
    int a,b;
    char ch;
    bool x;
    int i,j;
 
    cin>>a>>b;//行、列
    cin>>ch;//填充符号
    cin>>x;//空心或实心
 
    if(x)//实心
    {
        for(i=1; i<=a; i++)
        {
            for(j=1; j<=b; j++)   cout<<ch;
            cout<<endl;
        }
    }
    else//空心
    {
        for(i=1; i<=a; i++)
        {
            for(j=1; j<=b; j++)
            {
                if((i==1)||(i==a)||(j==1)||(j==b))//四条边均按条件输出
                    cout<<ch;
                else
                    cout<<" ";
            }
            cout<<endl;
        }
    }
    cout<<endl;
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main(){ double a; cin>>a; if(a<=150)printf("%.1lf",0.4463a); if(a<=400 and a>150)printf("%.1lf",0.4663(a-150)+0.4463150); if(a>400)printf("%.1lf",0.5663(a-400)+0.4463150+0.4663250); return 0;

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,w;
    char c;
    int d;
    cin>>a>>b>>c>>d;
    if(d==1){
        for(int i=1;i<=a*b;i++){
            cout<<c;
            if(i==b){
                cout<<endl;
            }
        }
    }
    w=b-2;
    if(d==0){
        for(int j=1;j<2;j++){
            cout<<c<<endl;
        }
        for(int k=1;k<=a-2;k++){
            cout<<c;
            for(int g=1;g<=w;g++){
                cout<<" ";
            }
            cout<<c;
        }
        for(int j=1;j<2;j++){
            cout<<c<<endl;
        }
    }
}

#include<bits/stdc++.h> using namespace std; int main(){ int c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z; char a,b; cin>>c>>d>>a>>e; for(f=1;f<=c;f++){ for(g=1;g<=d;g++){ if(e1){ printf("%c",a); } if(e0){ if(f1 or fc or g1 or gd){ printf("%c",a); } else{ cout<<" "; } } } cout<<endl; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main(){
    double a;
    cin>>a;
    if(a<=150)printf("%.1lf",0.4463*a);
    if(a<=400 and a>150)printf("%.1lf",0.4663*(a-150)+0.4463*150);
    if(a>400)printf("%.1lf",0.5663*(a-400)+0.4463*150+0.4663*250);
    return 0;

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