SMS

/*
    Task        : SMS Thumb
    Author      : Phumipat C. [MAGCARI]
    Language    : C++
*/
#include<bits/stdc++.h>
using namespace std;
char press(int x,int y,int m){
    if(x == 0 && y == 0){
        return '0';
    }else if(x == 1 && y == 0){
        m%=3;
        if(m == 0)      return 'C';
        else if(m == 1) return 'A';
        else if(m == 2) return 'B';
    }else if(x == 2 && y == 0){
        m%=3;
        if(m == 0)      return 'F';
        else if(m == 1) return 'D';
        else if(m == 2) return 'E';
    }else if(x == 0 && y == 1){
        m%=3;
        if(m == 0)      return 'I';
        else if(m == 1) return 'G';
        else if(m == 2) return 'H';
    }else if(x == 1 && y == 1){
        m%=3;
        if(m == 0)      return 'L';
        else if(m == 1) return 'J';
        else if(m == 2) return 'K';
    }else if(x == 2 && y == 1){
        m%=3;
        if(m == 0)      return 'O';
        else if(m == 1) return 'M';
        else if(m == 2) return 'N';
    }else if(x == 0 && y == 2){
        m%=4;
        if(m == 0)      return 'S';
        else if(m == 1) return 'P';
        else if(m == 2) return 'Q';
        else            return 'R';
    }else if(x == 1 && y == 2){
        m%=3;
        if(m == 0)      return 'V';
        else if(m == 1) return 'T';
        else if(m == 2) return 'U';
    }else{
        m%=4;
        if(m == 0)      return 'Z';
        else if(m == 1) return 'W';
        else if(m == 2) return 'X';
        else            return 'Y';
    }
}
char mes[85];
int main(){
    int n,s,m,x,y,idx = 0,cx,cy;
    scanf("%d %d %d",&n,&s,&m);
    switch(s){
        case 1: x=0,y=0;    break;
        case 2: x=1,y=0;    break;
        case 3: x=2,y=0;    break;
        case 4: x=0,y=1;    break;
        case 5: x=1,y=1;    break;
        case 6: x=2,y=1;    break;
        case 7: x=0,y=2;    break;
        case 8: x=1,y=2;    break;
        case 9: x=2,y=2;    break;
    }
    char res = press(x,y,m);
    if(res != '0')
        mes[idx] = res,idx++;
    for(int i=2;i<=n;i++){
        scanf("%d %d %d",&cx,&cy,&m);
        x+=cx,y+=cy;
        res = press(x,y,m);
        if(res != '0'){
            mes[idx] = res,idx++;
        }else if(idx != 0){
            idx--;
            mes[idx] = NULL;
        }
    }
    if(idx == 0)    printf("null\n");
    else            printf("%s\n",mes);
    return 0;
}