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Cod sursa(job #6174)
const r=104659;
var a:array[1..26,1..26] of integer;
b:array[1..26,1..1000] of longint;
n,m,i,j,k:integer;
l,l2,l3:char;
sol:longint;
f:text;
begin
assign(f,'nrcuv.in');
reset(f);
readln(f,n,m);
for i:=1 to m do begin
readln(f,l,l3,l2);
j:=ord(l)-96;
k:=ord(l2)-96;
a[j,k]:=1;
a[k,j]:=1;
end;
close(f);
for i:=1 to 26 do b[1,i]:=1;
for i:=2 to n do
for j:=1 to 26 do
for k:=1 to 26 do
if a[j,k]=0 then
b[i,j]:=(b[i,j]+b[i-1,k]) mod r;
for i:=1 to 26 do
sol:=(sol+b[n,i]) mod r;
assign(f,'nrcuv.out');
rewrite(f);
writeln(f,sol);
close(f);
end.