直接上代码保存一下：

#include<cctype>
#include<cstdio>
#include<cstring>
#define ll long long int
using namespace std;
//快读
inline ll read(){
   ll s=0,w=1;
   char ch=getchar();
   while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
   while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
   return s*w;
}
//快写
inline void out(ll a)
{
    if(a>=10)out(a/10);
    putchar(a%10+'0');
}
int main()
{
    ll n;
    n=read();
    out(n);
    return 0;
}