public static void main ( String hi [ ] ) throws Exception {
  BufferedReader infile = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( infile . readLine ( ) ) ;
  int T = Integer . parseInt ( st . nextToken ( ) ) ;
  while ( T -- > 0 ) {
    char [ ] arr = infile . readLine ( ) . toCharArray ( ) ;
    char [ ] brr = infile . readLine ( ) . toCharArray ( ) ;
    int N = arr . length ;
    int M = brr . length ;
    int dist2 = 0 ;
    for ( int i = M - 1 ;
    i >= 0 ;
    i -- ) {
      if ( brr [ i ] == '1' ) break ;
      dist2 ++ ;
    }
    int dist = 0 ;
    for ( int i = N - 1 ;
    i >= 0 ;
    i -- ) {
      if ( arr [ i ] == '1' && dist >= dist2 ) break ;
      dist ++ ;
    }
    int res = dist - dist2 ;
    System . out . println ( res ) ;
  }
}

public static void main ( String hi [ ] ) throws Exception { BufferedReader infile = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( infile . readLine ( ) ) ; int T = Integer . parseInt ( st . nextToken ( ) ) ; while ( T -- > 0 ) { char [ ] arr = infile . readLine ( ) . toCharArray ( ) ; char [ ] brr = infile . readLine ( ) . toCharArray ( ) ; int N = arr . length ; int M = brr . length ; int dist2 = 0 ; for ( int i = M - 1 ; i >= 0 ; i -- ) { if ( brr [ i ] == '1' ) break ; dist2 ++ ; } int dist = 0 ; for ( int i = N - 1 ; i >= 0 ; i -- ) { if ( arr [ i ] == '1' && dist >= dist2 ) break ; dist ++ ; } int res = dist - dist2 ; System . out . println ( res ) ; } }
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