#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main() {
    char s[100];
    scanf("%s", s);
    int len = strlen(s);
    char decoded_message[51];
    int decoded_index = 0;
    for (int i = 0; i < len; i += 2) {
        char pair[3];
        strncpy(pair, s + i, 2);
        pair[2] = '\0';
        int ascii_val = atoi(pair);
        if ((ascii-val >= 65 && ascii_val <= 90)|| (ascii_val >= 97 && ascii_val <= 122)) {
            decoded_message[decoded_index++] = (char)ascii_val;
    } else {
        printf("Exception Message\n");
        return 0;
}