#include <stdio.h>#include <memory.h>using namespace std;int main(void){int ncase;int m;int map[30][30];int mark[30][30];int lhs,rhs;char oprat;char str[5];scanf("%d",&ncase);for(int casenum=1;casenum<=ncase;++casenum){int flag(1);memset(map,0,sizeof(map));scanf("%d",&m);for(int i=0;i<m;++i){scanf("%s",&str);lhs=str[0]-'A';rhs=str[2]-'A';oprat=str[1];if(oprat=='<'){map[lhs][rhs]=1;}else{map[rhs][lhs]=1;}}memcpy(mark,map,sizeof(map));for(int k=0;k<30 ;++k){for(int i=0;i<30 ;++i){for(int j=0;j<30 ;++j){map[i][j] = map[i][j] || map[i][k] && map[k][j];}}}printf("Case %d:n",casenum);for(int i=0;i<30;++i){for(int j=0;j<30;++j){if((map[i][j]) && !mark[i][j] ){printf("%c<%cn",i+'A',j+'A');flag=0;}}}if(flag)printf("NONEn");}return 0;}
