Task: Data-Imputation (source dataset: tablib)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Rendering engine   | Browser                   | Platform(s)              | Engine version   | CSS grade   |
|:-------------------|:--------------------------|:-------------------------|:-----------------|:------------|
| Trident            | Internet  Explorer 4.0    | Win 95+                  | 4                | X           |
| Trident            | Internet  Explorer 5.0    | Win 95+                  | 5                | C           |
| Trident            | Internet  Explorer 5.5    | Win 95+                  | 5.5              | A           |
| Trident            | Internet  Explorer 6      | Win 98+                  | 6                | A           |
| Trident            | Internet Explorer 7       | Win XP SP2+              | 7                | A           |
| Trident            | AOL browser (AOL desktop) | Win XP                   | 6                | A           |
| Gecko              | Firefox 1.0               | Win 98+ / OSX.2+         | 1.7              | [MISSING]   |
| Gecko              | Firefox 1.5               | Win 98+ / OSX.2+         | 1.8              | A           |
| Gecko              | Firefox 2.0               | Win 98+ / OSX.2+         | 1.8              | A           |
| Gecko              | Firefox 3.0               | Win 2k+ / OSX.3+         | 1.9              | A           |
| Gecko              | Camino 1.0                | OSX.2+                   | 1.8              | A           |
| Gecko              | Camino 1.5                | OSX.3+                   | 1.8              | A           |
| Gecko              | Netscape 7.2              | Win 95+ / Mac OS 8.6-9.2 | 1.7              | A           |
| Gecko              | Netscape Browser 8        | Win 98SE+                | 1.7              | A           |
| Gecko              | Netscape Navigator 9      | Win 98+ / OSX.2+         | 1.8              | A           |
| Gecko              | Mozilla 1.0               | Win 95+ / OSX.1+         | 1                | A           |
| Gecko              | Mozilla 1.1               | Win 95+ / OSX.1+         | 1.1              | A           |
| Gecko              | Mozilla 1.2               | Win 95+ / OSX.1+         | 1.2              | A           |
| Gecko              | Mozilla 1.3               | Win 95+ / OSX.1+         | 1.3              | A           |
| Gecko              | Mozilla 1.4               | Win 95+ / OSX.1+         | 1.4              | A           |
| Gecko              | Mozilla 1.5               | Win 95+ / OSX.1+         | 1.5              | A           |
| Gecko              | Mozilla 1.6               | Win 95+ / OSX.1+         | 1.6              | A           |
| Gecko              | Mozilla 1.7               | Win 98+ / OSX.1+         | 1.7              | A           |
| Gecko              | Mozilla 1.8               | Win 98+ / OSX.1+         | 1.8              | A           |
| Gecko              | Seamonkey 1.1             | Win 98+ / OSX.2+         | 1.8              | A           |
| Gecko              | Epiphany 2.20             | Gnome                    | 1.8              | A           |
| Webkit             | Safari 1.2                | OSX.3                    | 125.5            | A           |
| Webkit             | Safari 1.3                | OSX.3                    | 312.8            | A           |
| Webkit             | Safari 2.0                | OSX.4+                   | 419.3            | A           |
| Webkit             | Safari 3.0                | OSX.4+                   | 522.1            | A           |
| Webkit             | OmniWeb 5.5               | OSX.4+                   | 420              | A           |
| Webkit             | iPod Touch / iPhone       | iPod                     | 420.1            | A           |
| Webkit             | S60                       | S60                      | 413              | A           |
| Presto             | Opera 7.0                 | Win 95+ / OSX.1+         | -                | A           |
| Presto             | Opera 7.5                 | Win 95+ / OSX.2+         | -                | A           |
| Presto             | Opera 8.0                 | Win 95+ / OSX.2+         | -                | A           |
| Presto             | Opera 8.5                 | Win 95+ / OSX.2+         | -                | A           |
| Presto             | Opera 9.0                 | Win 95+ / OSX.3+         | -                | A           |
| Presto             | Opera 9.2                 | Win 88+ / OSX.3+         | -                | A           |
| Presto             | Opera 9.5                 | Win 88+ / OSX.3+         | -                | A           |
| Presto             | Opera for Wii             | Wii                      | -                | A           |
| Presto             | Nokia N800                | N800                     | -                | A           |
| Presto             | Nintendo DS browser       | Nintendo DS              | 8.5              | C/A1        |
| KHTML              | Konqureror 3.1            | KDE 3.1                  | 3.1              | C           |
| KHTML              | Konqureror 3.3            | KDE 3.3                  | 3.3              | A           |
| KHTML              | Konqureror 3.5            | KDE 3.5                  | 3.5              | A           |
| Tasman             | Internet Explorer 4.5     | Mac OS 8-9               | -                | X           |
| Tasman             | Internet Explorer 5.1     | Mac OS 7.6-9             | 1                | C           |
| Tasman             | Internet Explorer 5.2     | Mac OS 8-X               | 1                | C           |
| Misc               | NetFront 3.1              | Embedded devices         | -                | C           |
| Misc               | NetFront 3.4              | Embedded devices         | -                | A           |
| Misc               | Dillo 0.8                 | Embedded devices         | -                | X           |
| Misc               | Links                     | Text only                | -                | X           |
| Misc               | Lynx                      | Text only                | -                | X           |
| Misc               | IE Mobile                 | Windows Mobile 6         | -                | C           |
| Misc               | PSP browser               | PSP                      | -                | C           |
| Other browsers     | All others                | -                        | -                | U           |
| Rendering engine   | Browser                   | Platform(s)              | Engine version   | CSS grade   |



row_idx: 6
col_idx: 4
col_name: CSS grade
label: A
output: value: A
tablib_key: tables/job=github_000005/batch=008354/nfC3E6CX1x-K8z3TEtBJJbPfg75pVbMfX83eZ5ddoio=