50分为什么=-=

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
using namespace std;
int main()
{
    int n,i,l,tail=0;
    char aaa[1000];
    gets(aaa);
    l=strlen(aaa);
    tail=aaa[l-1]-48;
    if(aaa[0]=='-')
     for(i=l-1;i>0;i--) 
     {
          if(tail==0)
            tail=aaa[i-1]-48;
        else           
          cout<<aaa[i];
     }
    else
     for(i=l-1;i>=0;i--) 
      {
          if(tail==0)
        tail=aaa[i-1]-48;
        else           
          cout<<aaa[i];
     }
    return 0;
}