#include<iostream>#include<stdio.h>#include<string.h> using namespace std;int num;int a, s, b;int getV(char c){ if(c<='9') return c-'0'; return c-'A'+10;}char setV(int d){ d &= 0x0f; if(d<=9) return d+'0'; return d+'a'-10;}void fun(){ char buf[4]; int i; a = b = s = 0; for(i=0; i<num; i++){ if(i){ if(i%16==0) printf("n"); else if(i%2==0) printf(" "); } scanf("%s", buf); a = getV(buf[0])*16 + getV(buf[1]); b = a - s; if(b < -8){ b = -8; } else if(b > 7){ b = 7; } s += b; printf("%c", setV(b)); } printf("n");}int main(){ while(scanf("%d", &num) > 0){ printf("%dn", num/2); fun(); } return 0;}
