#Dyalog APL, 14 bytes

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(?351)⊃⎕A/⍨⍳26

Gives instant results. Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!

Dyalog APL, 14 bytes

See this meta post for information about the code page.

(?351)⊃⎕A/⍨⍳26

Gives instant results. Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!

#Dyalog APL, 14 bytes

(?351)⊃⎕A/⍨⍳26

Gives instant results. Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!

#Dyalog APL, 14 bytes

See this meta post for information about the code page.

(?351)⊃⎕A/⍨⍳26

Gives instant results. Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!

#Dyalog APL, 14 bytes

(?351)⊃⎕A/⍨⍳26

Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!

#Dyalog APL, 14 bytes

(?351)⊃⎕A/⍨⍳26

Gives instant results. Works by selecting an evenly distributed random character among "ABBCCCDDDD..."

(?351) RandInt(1,351)
⊃picks among
⎕A "ABC...Z"
/⍨ element-by-element replicated
⍳26 {1, 2, 3, ..., 26} times

TryAPL online!