#include<stdio.h>
#include<string.h>
int main()
{
char input() {
    char input[101];
    char output[101];
    int index = 0;
    
    scanf("%s",input);
     int len = strlen(input);
     for(int i = 0;i<len;i+=2){
         char pair[3];
         pair[0] = input[i];
         pair[1] = input[i+1];
         pair[2] = '\0';
         
         int ascii = atol(pair);
         
         if((ascii >= 65 && ascii <= 90) || (ascii >= 97 && ascii <= 122)){
             outpuy[index++] = (char)ascii;
         }else{
             printf("Invalid Input");
         }
         }
         return 0;
         output[index] = '\o';
         printf("%s",output);
         return 0;
     
}