#include<iostream.h> #include<stdlib.h> int main() {     int n;     char f,q,l;     while(cin>>n)        //题目没有给出结束条件     {         if(n>1000000 || n<=0)    //辨断n的界线             exit(0);         char ar[26]={'a',};    //初始化，无确定的值的变量为0         //输入和赋值         for(int i=0;i<n;i++)         {             cin>>f>>q>>l;             if(ar[l-97]) ar[f-97]=f;             else ar[f-97]=0;         }         int j=0;         int temp=0;         //辨断变量是否有确定的值         while(j<26)         {             if(ar[j])             {                 temp=1;                 break;             }             j++;         }         //输出         if(temp)         {             cout<<ar[j];             j=j+1;             while(j<26)             {                 if(ar[j])                     cout<<" "<<ar[j];//从题目输出格式可知输出的最后一位不能有空格                 j++;             }             cout<<endl;         }         else             cout<<"none"<<endl;     }     return 0; }

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