#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <alloca.h>
 
void shifrator(char * s) {
    for (int i = 0; i < strlen(s); ++i) {
        s[i] = s[i] / 2;
    }
}
 
void deshifrator(char * s) {
    for (int i = 0; i < strlen(s); ++i) {
        s[i] = s[i] * 2;
    }
}
 
int main() {
    char * stroka = alloca(100);
    strcpy(stroka, "Съешь же ещё этих мягких французских булок, да выпей чаю.");
    shifrator(stroka);
    deshifrator(stroka);
    printf("%s\n", stroka);
    return 0;
}

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