/* Convert base codes into their complements.
 * These are standard IUPAC-IUB single-letter base codes.
 */

/* Copyright (c) 2004 Blossom Associates West */
/* All rights reserved.                       */

#include <stdio.h>

int main( int argc, char* argv[] ) {

  int c;
  int p = 0;

  while ( EOF != ( c = getchar() ) ) {

    if ( 'c' == c ) c = 'g';
    else if ( 'g' == c ) c = 'c';
    else if ( 'a' == c ) c = 't';
    else if ( 't' == c ) c = 'a';
    else if ( 'u' == c ) c = 'a';

    else if ( 'C' == c ) c = 'G';
    else if ( 'G' == c ) c = 'C';
    else if ( 'A' == c ) c = 'T';
    else if ( 'T' == c ) c = 'A';
    else if ( 'U' == c ) c = 'A';

    else if ( 'm' == c ) c = 'k';
    else if ( 'r' == c ) c = 'y';
/*  else if ( 'w' == c ) c = 'w'; */
/*  else if ( 's' == c ) c = 's'; */
    else if ( 'y' == c ) c = 'r';
    else if ( 'k' == c ) c = 'm';
    else if ( 'v' == c ) c = 'b';
    else if ( 'h' == c ) c = 'd';
    else if ( 'd' == c ) c = 'h';
    else if ( 'b' == c ) c = 'v';
/*  else if ( 'x' == c ) c = 'x'; */
    else if ( 'n' == c ) c = 'x';

    else if ( 'M' == c ) c = 'K';
    else if ( 'R' == c ) c = 'Y';
/*  else if ( 'W' == c ) c = 'W'; */
/*  else if ( 'S' == c ) c = 'S'; */
    else if ( 'Y' == c ) c = 'R';
    else if ( 'K' == c ) c = 'M';
    else if ( 'V' == c ) c = 'B';
    else if ( 'H' == c ) c = 'D';
    else if ( 'D' == c ) c = 'H';
    else if ( 'B' == c ) c = 'V';
/*  else if ( 'X' == c ) c = 'X'; */
    else if ( 'N' == c ) c = 'X';

/*  else if ( '.' == c ) c = '.'; */

      putchar( c );
  }

}