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#include <stdio.h>
int main(){
int s, r;
scanf("%d %d", &s, &r);
while(s>0){
int left, right, i;
int gapsl[100000], gapsr[100000], gap_index=0;
while(r--){
int left_seek, right_seek, curr_gapindex;
scanf("%d %d", &left, &right);
left--; right--; /* adjust for 0 index */
curr_gapindex = gap_index++;
gapsl[curr_gapindex]=left;
gapsr[curr_gapindex]=right;
left_seek=left-1;
right_seek=right+1;
int gap_collision=0;
for(i=0; i<=curr_gapindex; i++){
while(gapsl[i]<=left_seek && gapsr[i]>=left_seek){
left_seek--;
gap_collision=1;
}
if(gap_collision){
i=-1;
gap_collision=0;
}
}
if(left_seek<0)
printf("* ");
else
printf("%d ", left_seek+1);
gap_collision=0;
for(i=0; i<=curr_gapindex; i++){
while(gapsr[i]>=right_seek && gapsl[i]<=right_seek){
right_seek++;
gap_collision=1;
}
if(gap_collision){
i=-1;
gap_collision=0;
}
}
if(right_seek>=s)
printf("*\n");
else
printf("%d\n", right_seek+1);
}
printf("-\n");
scanf("%d %d", &s, &r);
}
return 0;
}
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