| Letter | Length | Country | % Correct |
|---|---|---|---|
| Y | 5 | Yemen | 90%
|
| O | 4 | Oman | 89%
|
| Z | 8 | Zimbabwe | 89%
|
| Q | 5 | Qatar | 87%
|
| D | 28 | Democratic Republic of the Congo | 77%
|
| K | 10 | Kazakhstan / Kyrgyzstan | 71%
|
| F | 27 | Federated States of Micronesia | 67%
|
| H | 8 | Honduras | 66%
|
| J | 7 | Jamaica | 66%
|
| R | 18 | Republic of the Congo | 66%
|
| A | 17 | Antigua and Barbuda | 62%
|
| U | 18 | United Arab Emirates | 59%
|
| S | 27 | Saint Vincent and the Grenadines | 53%
|
| V | 11 | Vatican City | 52%
|
| T | 17 | Trinidad and Tobago | 51%
|
| L | 13 | Liechtenstein | 48%
|
| C | 22 | Central African Republic | 46%
|
| P | 14 | Papua New Guinea | 46%
|
| B | 20 | Bosnia and Herzegovina | 41%
|
| M | 15 | Marshall Islands | 40%
|
| N | 14 | North Macedonia | 38%
|
| E | 16 | Equatorial Guinea | 36%
|
| G | 12 | Guinea-Bissau | 32%
|
| I | 10 | Ivory Coast | 25%
|