#include<stdio.h>
int main()
{	
	long long a,b,i,d=0,e,f=0;
	char c;
	scanf("%lld%c",&a,&c);
	if(c!='%'&&c!='\n'){
		scanf("%lld",&b);
		i=a;
		e=b;
		while(i)
		{
			d=d*10+i%10;
			i=i/10;
		}
		while(e){
			f=f*10+e%10;
			e=e/10;
		}
		printf("%lld%c%lld",d,c,f);
	}
	else if(c=='%'){
		long long g,h=0;
		g=a;
		while(g){
			h=h*10+g%10;
			g=g/10;
		}
		printf("%lld%c",h,c);
	}
	else{
		long long p,sum=0;
		p=a;
		while(p){
			sum=sum*10+p%10;
			p=p/10;
		}
		printf("%lld",sum);
	}
	return 0;
}

![输出这个]("D:\屏幕截图\屏幕截图 2024-12-03 162218.png")