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import string;

const string WELCOME = "Hello, world!";

# Adler-32 is a checksum algorithm invented by Mark Adler in 1995.
function adler32 : string as message, int as messageLength;
    const int MOD_ADLER = 65521;

    string char;
    int charValue;
  
    int s1 = 1;
    int s2 = 0;
    int n = 0;
  
    while n < messageLength;
        call char_at : message, n -> char;
        call char_to_int : char -> charValue;
    
        s1 = (s1 + charValue) % MOD_ADLER;
        s2 = (s2 + s1) % MOD_ADLER;
    
        n += 1;
    end;
  
    s2 = (s2 << 16) | s1;
return s2;

int welcomeLength;
call length : WELCOME -> welcomeLength;

int hash;

call adler32 : WELCOME, welcomeLength -> hash;