#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC0(i, n) FOR(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC0(i, n) REV(i, 0, n)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;


char s[1025];

int main() {
	scanf("%s", s);
	
	int len = 0;
	while(s[len] != '\0') { len++; }
	
	INC0(i, len) { s[i] = ( 260000 + (s[i] - 'A') - (i + 1) ) % 26 + 'A'; }
	
	printf("%s\n", s);
	
	return 0;
}