# include <stdio.h>
# include <string.h>
typedef char Str50[50] ;
int main() {
  Str50 str1 ;
  int i = 0, j = 0 ;
  while ( scanf( "%s", str1 ) != EOF ) {
    int length = strlen(str1) ;
    for ( int i = 0, j = length - 1 ; i < length, j >= 0 ; i++, j-- ) {
      if ( str1[i] != str1[j] )
        printf( "no\n" ) ;
    } // for
    if ( str1[i] == str1[j] )
      printf( "yes\n") ;
  } // while

} // main()

已解決