To find GZ, you must first solve this puzzle.
[1x4] [1x1] [4x5] [2x5] [4x4] [2x12] [2x11] [1x9] [13x1] [26x1] [11x2] [5x5] [5x3] [1x3]
[2x2] [7x2] [2x10] [2x5] [16x1] [2x11] [1x13] [1x26] [10x1] [9x1] [1x15] [3x1] [13x2] [13x1] [1x4]
[1x2] [1x3] [15x1] [3x5] [13x1] [2x11] [12x2] [3x2] [3x5] [3x1] [2x13] [1x24] [1x10] [5x2]
[13x1] [1x25] [4x1] [3x3] [1x22] [1x15] [2x13] [7x2] [1x1] [2x5] [1x13] [5x3] [1x3] [13x2]
[3x1] [1x4] [25x1] [1x26] [22x1] [1x13] [26x1] [2x7] [1x10] [2x8] [5x3] [1x3] [3x5] [3x1]
[13x1] [13x2] [2x13] [1x1] [2x2] [1x17] [26x1] [5x2] [3x3] [1x26] [1x26] [2x2] [2x1] [1x3]
[1x15] [1x9] [1x4] [9x1] [13x2] [1x1] [2x5] [8x2] [13x1] [14x1] [1x4] [1x19] [13x2] [11x2]
[2x7] [15x1] [2x5] [3x3] [2x13] [3x1] [4x4] [1x9] [25x1] [1x13] [26x1] [5x5] [2x11] [9x1]
[25x1] [1x1] [10x1] [1x13] [3x5] [4x5] [3x3] [4x1] [3x3] [26x1] [3x7] [1x26] [13x1] [5x2]
[9x1] [2x2] [1x9] [13x2] [1x11] [2x5] [2x2] [1x9] [15x1] [5x3] [2x9] [10x1] [1x3] [1x16] [9x1]
[1x25] [1x13] [13x2] [25x1] [2x11] [3x3] [5x5] [2x13] [2x2] [1x2] [3x1] [5x3] [5x4] [13x2]
[4x1] [2x1] [1x3] [1x15] [5x3] [3x1] [1x26] [1x3] [1x4] [25x1] [26x1] [1x4] [2x7] [11x2] [9x1]
[26x1] [1x22] [7x2] [2x10] [1x1] [2x2] [1x9] [5x5] [2x11] [1x23] [1x4] [14x1] [1x10] [3x3]
[10x1] [3x3] [3x5] [3x1] [2x13] [1x1] [13x2] [9x1] [24x1] [26x1] [1x7] [4x1] [1x9] [1x26]
[11x1] [5x2] [1x14] [15x1] [22x1] [3x5] [1x15] [1x3] [4x1] [2x1] [3x1] [1x3] [2x13] [2x2]
[1x2] [3x1] [5x3]