main(r,a,b){char t[64];r=atoi(gets(t));gets(t);for(a=0;t[a];a++){if(isalpha(t[a]))for(b=0;b++<r;)\x0d
++t[a]=='{'?t[a]=97:t[a]==91?t[a]=65:0;t[a]==63?t[a]=33:t[a]==33?t[a]=63:0;}puts(t);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).